HEAT EXCHANGER FOR A GAS TURBINE ENGINE

A heat exchanger is provided. The heat exchanger includes one or more exchanger units that each have a core and manifolds. The core of an exchanger unit is formed by multiple unit cells coupled together in flow communication to create a flow distribution grid. Each unit cell has at a first primary channel, a second primary channel, a first secondary channel in flow communication with the first primary channel, and a second secondary channel in flow communication with the second primary channel. The first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel. Each manifold includes two chambers for separating fluids flowing through the heat exchanger, with one chamber being in flow communication with one of the primary channels and having one or more tubes traversing therethrough to provide flow communication between the other primary channel and the other chamber.

FIELD

The present disclosure relates to heat exchangers, and more particularly to heat exchangers for gas turbine engines.

BACKGROUND

A gas turbine engine can include one or more heat exchangers. For example, a gas turbine engine can include a buffer air heat exchanger configured to cool relatively warm high pressure air using relatively cool low pressure air. The cooled high pressure air can be used to cool certain components, such as bearings of the gas turbine engine. To compensate for the relatively low heat transfer capability of air, such heat exchangers have conventionally been bulky and heavy.

DETAILED DESCRIPTION

The term “at least one of” in the context of, e.g., “at least one of A, B, and C” refers only A, only B, only C, or any combination of A, B, and C.

Approximating language, as used herein throughout the specification and claims, is applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term or terms, such as “about”, “approximately”, and “substantially”, are not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value, or the precision of the methods or machines for constructing or manufacturing the components and/or systems. For example, the approximating language may refer to being within a 1, 2, 4, 10, 15, or 20 percent margin. These approximating margins may apply to a single value, either or both endpoints defining numerical ranges, and/or the margin for ranges between endpoints.

Some gas turbine engines can include one or more heat exchangers. For instance, a gas turbine engine can include a buffer air heat exchanger configured to cool relatively warm high pressure air using relatively cool low pressure air. For example, a gas turbine engine can include a buffer air heat exchanger configured to cool relatively warm high pressure air drawn from a high pressure compressor using relatively cool low pressure air discharged from a low pressure compressor. The cooled high pressure air can be used to cool certain components, such as bearings of the gas turbine engine. To compensate for the relatively low heat transfer capability of air, such heat exchangers have conventionally been bulky and heavy. The weight and space occupied by a heat exchanger in a gas turbine engine are of importance as space is limited and the weight of a heat exchanger directly impacts the efficiency of the gas turbine engine and aircraft to which it is mounted.

In accordance with the inventive aspects of the present disclosure, a heat exchanger for a turbine engine is provided. The arrangement and construction of the heat exchanger may enable the heat exchanger to be compact and highly efficient. In one example aspect, a heat exchanger includes a plurality of exchanger units. Each exchanger unit has a core and two manifolds. The exchanger units can be stacked and coupled together in flow communication to form exchanger pairs.

The core of an exchanger unit is formed by multiple unit cells coupled together in flow communication with one another to create a flow distribution grid. The unit cells are arranged to enable a large heat transfer area, and can be assembled to conform with any flow path. The unit cells can define first channels configured to receive a first fluid and second channels configured to receive a second fluid. The channels enable multiple flow branches with localized turbulence to enhance heat transfer.

Particularly, each unit cell can have two parallel primary channels that are perpendicular to two secondary channels. The two secondary channels can be parallel to one another. The two primary channels are also optionally perpendicular to tertiary channels. The tertiary channels are parallel to one another and are also perpendicular to the secondary channels. The primary channels allow for both fluid sides to flow in counterflow direction. The secondary channels/tertiary channels allow for both fluid sides to flow in counterflow and/or crossflow direction with each other and in crossflow direction with the primary channels.

On two diagonally-opposite sides of a unit cell, the secondary/tertiary channels allow for either single or double (t-shaped) crossflow arrangements that are perpendicular to the primary channel flow. On the other two diagonally-opposite sides of the unit cell, the primary channel and the secondary/tertiary channels extending from a junction with the primary channel allow for either trifurcating flow arrangements (when no tertiary channels are present) or pentafurcating flow arrangements (when the tertiary channels are present). The counterflows, crossflows, and trifurcating and/or pentafurcating flow arrangements enable localized turbulence and a large heat transfer surface area, thereby enabling efficient heat transfer.

The manifolds enable compact arrangement of multiple exchanger units. Particularly, the manifolds enable the flow inlet and outlet of the two fluid sides to flow in either a countercurrent or co-current flow direction. Each manifold includes two compartments or chambers—one for each fluid side. In the chamber nearest to the core, the primary channels for one fluid side extend out from the core as a plurality of tubes, while the primary channel for the other fluid side terminates at the core edge. The ends of the tubes (extended primary channels) connect to a partition wall, which acts as a barrier between the two chambers. This arrangement allows for both fluid sides to be separated into distinct chambers. A manifold of one exchanger unit may be arranged in flow communication with a manifold of another exchanger unit to form an exchanger pair, thereby facilitating compact arrangement of the exchanger units of the heat exchanger.

Referring now to the drawings,FIG.1provides a schematic cross-sectional view of a gas turbine engine100according to an example embodiment of the present disclosure. For the depicted embodiment ofFIG.1, the gas turbine engine100is an aeronautical, high-bypass turbofan jet engine configured to be mounted to an aircraft, e.g., in an under-wing configuration. As shown, the gas turbine engine100defines an axial direction A, a radial direction R, and a circumferential direction C. The axial direction A extends parallel to or coaxial with a longitudinal centerline102defined by the gas turbine engine100.

The gas turbine engine100includes a fan section104and a core turbine engine106disposed downstream of the fan section104. The core turbine engine106includes an engine cowl108that defines an annular core inlet110. The engine cowl108encases, in a serial flow relationship, a compressor section112including a first, booster or LP compressor114and a second, HP compressor116; a combustion section118; a turbine section120including a first, HP turbine122and a second, LP turbine124; and an exhaust section126. Thus, the compressor section112, combustion section118, turbine section120, and the exhaust section126are in a serial flow arrangement. An HP shaft128drivingly connects the HP turbine122to the HP compressor116. An LP shaft130drivingly connects the LP turbine124to the LP compressor114. The compressor section112, combustion section118, turbine section120, and exhaust section126together define a core air flowpath132through the core turbine engine106.

The fan section104includes a fan134having a plurality of fan blades136coupled to a disk138in a circumferentially spaced apart manner. As depicted, the fan blades136extend outward from the disk138generally along the radial direction R. Each fan blade136is rotatable relative to the disk138about a pitch axis P by virtue of the fan blades136being operatively coupled to a suitable actuation member140configured to collectively vary the pitch of the fan blades136, e.g., in unison. The fan blades136, disk138, and actuation member140are together rotatable about the longitudinal centerline102by the LP shaft130across a power gearbox142. The power gearbox142includes a plurality of gears for stepping down the rotational speed of the LP shaft130to affect a more efficient rotational fan speed. In other embodiments, the fan blades136, disk138, and actuation member140can be directly connected to the LP shaft130, e.g., in a direct-drive configuration. Further, in other embodiments, the fan blades136of the fan134can be fixed-pitch fan blades.

Referring still toFIG.1, the disk138is covered by a rotatable spinner144aerodynamically contoured to promote an airflow through the plurality of fan blades136. Additionally, the fan section104includes an annular fan casing or outer nacelle146that circumferentially surrounds the fan134and/or at least a portion of the core turbine engine106. The nacelle146is supported relative to the core turbine engine106by a plurality of circumferentially-spaced outlet guide vanes148. A downstream section150of the nacelle146extends over an outer portion of the core turbine engine106so as to define a bypass airflow passage152therebetween.

During operation of the gas turbine engine100, a volume of air154enters the gas turbine engine100through an associated inlet156of the nacelle146and/or fan section104. As the volume of air154passes across the fan blades136, a first portion of the air indicated by arrows158is directed or routed into the bypass airflow passage152and a second portion indicated by arrow160is directed or routed into the core inlet110and into the LP compressor114. The pressure of the second portion of air160is increased as it is routed through the LP compressor114and the HP compressor116. The compressed second portion of air160is then discharged into the combustion section118.

The compressed second portion of air160from the compressor section112mixes with fuel and is burned within a combustor of the combustion section118to provide combustion gases162. The combustion gases162are routed from the combustion section118along a hot gas path174of the core air flowpath132through the HP turbine122where a portion of thermal and/or kinetic energy from the combustion gases162is extracted via sequential stages of HP turbine stator vanes164and HP turbine blades166. The HP turbine blades166are mechanically coupled to the HP shaft128. Thus, when the HP turbine blades166extract energy from the combustion gases162, the HP shaft128rotates, thereby supporting operation of the HP compressor116. The combustion gases162are routed through the LP turbine124where a second portion of thermal and kinetic energy is extracted from the combustion gases162via sequential stages of LP turbine stator vanes168and LP turbine blades170. The LP turbine blades170are coupled to the LP shaft130. Thus, when the LP turbine blades170extract energy from the combustion gases162, the LP shaft130rotates, thereby supporting operation of the LP compressor114and the fan134.

The combustion gases162are subsequently routed through the exhaust section126of the core turbine engine106to provide propulsive thrust. Simultaneously, the pressure of the first portion of air158is substantially increased as the first portion of air158is routed through the bypass airflow passage152before it is exhausted from a fan nozzle exhaust section172of the gas turbine engine100, also providing propulsive thrust. The HP turbine122, the LP turbine124, and the exhaust section126at least partially define the hot gas path174for routing the combustion gases162through the core turbine engine106.

As further shown inFIG.1, the gas turbine engine100includes a cooling system190for cooling various components, such as a bearing180. The cooling system190includes one or more heat exchangers, such as heat exchanger192. The heat exchanger192can be a Buffer Air Heat Exchanger (BAHE), for example. For this embodiment, the heat exchanger192is configured to receive low pressure compressor discharge bleed air to cool air bled from the HP compressor116before the cooled HP compressor air is delivered to cool the bearing180and optionally other components as well. The low pressure compressor discharge bleed air can be bled from the core air flowpath132and routed to the heat exchanger192via a first delivery conduit194. Bleed air from the HP compressor116can be routed to the heat exchanger192via as second delivery conduit196. After being cooled by the low pressure compressor discharge bleed air at the heat exchanger192, the cooled bleed air from the HP compressor116can be routed to the bearing180via a third delivery conduit198. Although not shown, the low pressure compressor discharge bleed air can be routed from the heat exchanger192to any suitable location, such as to a core compartment, back to the core air flowpath132, to another heat exchanger, or to another suitable location. A compact, highly efficient heat exchanger that may be implemented as a BAHE is provided herein.

Further, it will be appreciated that the gas turbine engine100depicted inFIG.1is provided by way of example only, and that in other example embodiments, the gas turbine engine100may have any other suitable configuration. Additionally, or alternatively, aspects of the present disclosure may be utilized with any other suitable aeronautical gas turbine engine, such as a turboshaft engine, turboprop engine, turbojet engine, etc. Further, aspects of the present disclosure may further be utilized with any other land-based gas turbine engine, such as a power generation gas turbine engine, or any aeroderivative gas turbine engine, such as a nautical gas turbine engine. Moreover, the inventive aspects disclosed herein are not limited to turbine engines; rather, the inventive aspects are applicable to any suitable application in which a heat exchanger is implemented. In this regard, the inventive aspects of the present disclosure are applicable to many industries, including the aviation industry, oil and gas industry, automotive industry, power generation industry, the food and beverage industry, and the pharmaceutical industry, among other industries and applications.

FIG.2provides a perspective view of a heat exchanger200in accordance with an example embodiment of the present disclosure. The heat exchanger200can be implemented as the BAHE provided inFIG.1, for example. As depicted, the heat exchanger200defines a vertical direction V, a lateral direction L, and a transverse direction T that are orthogonal to one another. The heat exchanger200includes a plurality of exchanger units210. The exchanger units210can be compactly arranged in any suitable configuration. For this embodiment, the heat exchanger200includes twenty (20) exchanger units210, including ten right-side exchanger units stacked on top of one another along the vertical direction V and ten left-side exchanger units stacked on top of one another along the vertical direction V. Although the heat exchanger200ofFIG.2has twenty exchanger units210, in other example embodiments, the heat exchanger200can include any suitable number of exchanger units, such as one exchanger unit, eight exchanger units, fifty exchanger units, etc. Further, in other embodiments, the exchanger units210can be positioned side-by-side rather than stacked on one another.

With reference now toFIGS.2,3,4, and5,FIG.3provides a perspective view of a first exchanger unit211of the heat exchanger200ofFIG.2.FIG.4provides a perspective view of a first manifold228of the first exchanger unit211andFIG.5provides a perspective view of a second manifold230of the first exchanger unit211. Generally, each exchanger unit210of the heat exchanger200has a core and two manifolds.

Particularly, as depicted, the first exchanger unit211includes a core222defining first channels224and second channels226. The first channels224can receive a first fluid F1and the second channels226can receive a second fluid F2. The first fluid F1and the second fluid F2can both be air, for example. In this regard, the heat exchanger200can be an air-to-air heat exchanger. The first fluid F1flowing through the first channels224can be both warmer and at a higher pressure than the second fluid F2flowing through the second channels226, or vice versa. In this way, thermal energy can be exchanged between the first and second fluids F1, F2as they flow through the first exchanger unit211.

Although the core222of the first exchanger unit211is shown in a double U-bend channel configuration, it will be appreciated that the core222of the first exchanger unit211(as well as the cores of the other exchanger units210) can have other suitable configurations such as a straight channel configuration shown inFIG.6or the single U-bend channel configuration shown inFIG.7. The core222of the first exchanger unit211, or more generally, the core of an exchanger unit will be described in greater detail later in the disclosure.

The first exchanger unit211includes the first manifold228and the second manifold230, as noted. For this embodiment, the first manifold228is arranged to distribute the second fluid F2into the core222and to receive the first fluid F1flowing out of the core222. In contrast, the second manifold230is arranged to distribute the first fluid F1into the core222and to receive the second fluid F2flowing out the core222.

The first manifold228has a housing232and a partition wall234that together define two chambers, including a first chamber236and a second chamber238. The housing232is shown transparent inFIG.4for illustrative purposes. The first chamber236and the second chamber238are separated by the partition wall234, e.g., along the transverse direction T. In this regard, the first chamber236and the second chamber238of the first manifold228are fluidly isolated from one another. The first chamber236is in flow communication with the first channels224of the core222. In this way, the first fluid F1can flow out of the core222into the first chamber236, or vice versa in other embodiments.

The first manifold228also includes a plurality of tubes240that extend through the first chamber236and the partition wall234to provide flow communication between the second chamber238and the second channels226. In this way, the second fluid F2can flow from the second chamber238, through the tubes240extending through the first chamber236, and into the second channels226, or vice versa in other embodiments. The partition wall234can define one or more apertures to receive the tubes240as shown inFIG.4.

The second manifold230has a housing242and a partition wall244that together define two chambers, including a first chamber246and a second chamber248. The housing242is shown transparent inFIG.5for illustrative purposes. The first chamber246and the second chamber248are separated by the partition wall244, e.g., along the transverse direction T. In this manner, the first chamber246and the second chamber248of the second manifold230are fluidly isolated from one another. The first chamber246is in flow communication with the first channels224of the core222. In this way, the first fluid F1can flow from the first chamber246into the core222, or vice versa in other embodiments.

The second manifold230also includes a plurality of tubes250that extend through the first chamber246and the partition wall244to provide flow communication between the second chamber248and the second channels226. In this way, the second fluid F2can flow from the second channels226of the core222, through the tubes250extending through the first chamber246, and into the second chamber248, or vice versa in other embodiments.

Referring now toFIGS.2,8,9, and10,FIG.8provides an exploded, perspective view of the first exchanger unit211paired with a second exchanger unit212. The second exchanger unit212is arranged to form an exchanger pair with the first exchanger unit211.FIG.9provides a perspective view of an interaction between two of the manifolds of the exchanger units211,212of the exchanger pair ofFIG.8.FIG.10provides a perspective view of an interaction between the two other manifolds of the exchanger units211,212of the exchanger pair ofFIG.8.

Generally, the second exchanger unit212is configured in a similar manner as the first exchanger unit211. The second exchanger unit212includes a core252defining first channels254and second channels256. The first channels254are configured to receive the first fluid F1while the second channels256are configured to receive the second fluid F2. The second exchanger unit212also includes a first manifold258and a second manifold260.

The first manifold258of the second exchanger unit212has a housing262and a partition wall264that together define a third chamber266and a fourth chamber268. The third chamber266and the fourth chamber268are separated by the partition wall264. The third chamber266is in flow communication with the first channels254of the core252of the second exchanger unit212. The first manifold258of the second exchanger unit212includes a plurality of tubes270that extend through the third chamber266and the partition wall264of the second exchanger unit212to provide flow communication between the fourth chamber268and the second channels256of the core252of the second exchanger unit212. Notably, the third chamber266is not in flow communication with the first chamber236, and the fourth chamber268is not in flow communication with the second chamber238. For instance, for this embodiment, a chamber wall282separates the first chamber236and the third chamber266and separates the second chamber238and the fourth chamber268, e.g., along the vertical direction V.

As shown inFIG.9, the first exchanger unit211, or rather the first manifold228thereof, has a first port290allowing for flow communication into or out of the first chamber236and a second port292allowing for flow communication into or out of the second chamber238. For this embodiment, for example, the first fluid F1can flow out of the first chamber236through the first port290and the second fluid F2can flow into the second chamber238through the second port292. Similarly, the second exchanger unit212, or rather the first manifold258thereof, has a third port294allowing for flow communication into or out of the third chamber266and a fourth port296allowing for flow communication into or out of the fourth chamber268. For this embodiment, the first fluid F1can flow out of the third chamber266through the third port294and the second fluid F2can flow into the fourth chamber268through the fourth port296.

As shown inFIG.10, the second manifold260of the second exchanger unit212has a housing272and a partition wall274that together define a third chamber276and a fourth chamber278. The third chamber276and the fourth chamber278are separated by the partition wall274. The third chamber276is in flow communication with the first channels254of the core252of the second exchanger unit212. The second manifold260of the second exchanger unit212includes a plurality of tubes280that extend through the third chamber276and the partition wall274of the second exchanger unit212to provide flow communication between the fourth chamber278and the second channels256of the core252of the second exchanger unit212.

Generally, the first fluid F1flows through the core252of the second exchanger unit212in a direction opposite in which the first fluid F1flows through the core222of the first exchanger unit211. Similarly, the second fluid F2flows through the core252of the second exchanger unit212in a direction opposite in which the second fluid F2flows through the core222of the first exchanger unit211. Such flows are enabled, at least in part, by the arrangement of the second manifold230of the first exchanger unit211and the second manifold260of the second exchanger unit212.

Particularly, as shown inFIG.10, the third chamber276is in flow communication with the first chamber246. In this regard, the third chamber276and the first chamber246collectively form an exchanger pair chamber that allows the first fluid F1to flow between the second exchanger unit212and the first exchanger unit211. Specifically, the first fluid F1can flow out of the first channels254of the core252of the second exchanger unit212into the third chamber276, and then may flow from the third chamber276into the first chamber246, and ultimately into the first channels224of the first exchanger unit211.

Also, as depicted inFIG.10, the fourth chamber278is in flow communication with the second chamber248. In this regard, the fourth chamber278and the second chamber248collectively form an exchanger pair chamber that allows the second fluid F2to flow between the first exchanger unit211and the second exchanger unit212. Accordingly, the second fluid F2can flow out of the second channels226of the core222of the first exchanger unit211into the tubes250across the first chamber246and into the second chamber248, and then may flow from the second chamber248into the fourth chamber278, and thereafter, the second fluid F2can flow from the fourth chamber278into the tubes280across the third chamber276, and ultimately into the second channels256of the core252of the second exchanger unit212.

The other exchanger units of the heat exchanger200can form exchanger pairs with one another in the same manner as the first and second exchanger units211,212form an exchanger pair. For instance, with reference toFIG.2, the third and fourth exchanger units213,214can form an exchanger pair, the fifth and sixth exchanger units215,216can form an exchanger pair, the seventh and eighth exchanger units217,218can form an exchanger pair, and the ninth and tenth exchanger units219,220can form an exchanger pair. The exchanger units210on the left side of the heat exchanger200can likewise form exchanger pairs.

With reference now toFIGS.2,11,12,13, and14, the core of an exchanger unit of the heat exchanger200will now be described in further detail.FIG.11provides a schematic cross-sectional view of a portion of the core222of the first exchanger unit211.FIG.12provides a perspective view of one unit cell of the core222ofFIG.11.FIG.13provides a perspective view of the flow distribution of the unit cell ofFIG.12.FIG.14provides a perspective view of the first channels224and the second channels226of the core222. Although the core222of the first exchanger unit211is described, it will be appreciated that the core of each exchanger unit210of the heat exchanger200can be constructed as provided below.

As depicted, the core222has a plurality of unit cells300coupled together in flow communication to define a flow distribution grid of the first exchanger unit211. The unit cells300can be arranged to conform to the shape of the desired flow path with any suitable number of bends, e.g., a double U-bend channel configuration as shown inFIG.3, a straight channel configuration as shown inFIG.6, a single U-bend channel configuration as shown inFIG.7, etc. The unit cells300of the portion of the core222are individually labeled inFIG.11as300A through300J.

Generally, each unit cell300includes a cell block that defines a first primary channel, a second primary channel, a first secondary channel in flow communication with the first primary channel, and a second secondary channel in flow communication with the second primary channel. The first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel. In some embodiments, the first primary channel and the second primary channel are arranged parallel to one another and the first secondary channel and the second secondary channel are arranged perpendicular to the first primary channel and the second primary channel.

In some embodiments, the secondary channels can extend lengthwise in a plane in which the primary channels also extend lengthwise. For instance, the secondary channels and the primary channels can both extend lengthwise in a horizontal plane that is perpendicular to the vertical direction V. For example, the primary channels can extend lengthwise along the transverse direction T and the secondary channels can extend lengthwise along the lateral direction L. In other embodiments, the secondary channels can extend lengthwise in a different plane than the primary channels. For instance, the primary channels can extend lengthwise in a horizontal plane that is perpendicular to the vertical direction V and the secondary channels can extend lengthwise in a vertical plane. For example, the primary channels can extend lengthwise along the transverse direction T (or lateral direction L) and the secondary channels can extend lengthwise along the vertical direction V.

The first primary channel of a given unit cell is in flow communication with a first primary channel of an adjacent unit cell, a second primary channel of a given unit cell is in flow communication with a second primary channel of an adjacent unit cell, a first secondary channel of a given unit cell is in flow communication with the first primary channel of the given unit cell and is also in flow communication with a first secondary channel of an adjacent unit cell, and a second secondary channel of a given unit cell is in flow communication with the second primary channel of the given unit cell and also in flow communication with a second secondary channel of an adjacent unit cell. The first primary channels and the first secondary channels of the plurality of unit cells300collectively form the first channels224of the core222and the second primary channels and the second secondary channels of the plurality of unit cells300collectively form the second channels of the core222.

By way of example, the unit cell300B of the core222is depicted inFIG.12. The unit cell300B includes a cell block310. The cell block310can be formed of any suitable material. The cell block310extends between a first side312and a second side314, e.g., along the lateral direction L, and between a front316and a back318, e.g., along the transverse direction T. The cell block310defines a first primary channel320configured to receive the first fluid F1. The first primary channel320has a diameter D1P (see unit cell300H inFIG.11) and spans between the front316and the back318of the unit cell300B along the transverse direction T. The cell block310also defines a second primary channel322configured to receive the second fluid F2. The second primary channel322has a diameter D2P (see unit cell300E inFIG.11) and spans between the front316and the back318of the unit cell300B along the transverse direction T. The first primary channel320and the second primary channel322are arranged parallel to one another in this embodiment.

The cell block310further defines a first secondary channel324configured to receive the first fluid F1. The first secondary channel324has a diameter D1S (see unit cell300I inFIG.11) and spans between the first side312and the second side314of the unit cell300B along the lateral direction L. The first secondary channel324is in flow communication with the first primary channel320. Specifically, the cell block310defines a first bridge aperture326(FIG.11) through a bridge328of the cell block310. The first bridge aperture326provides flow communication between the first primary channel320and a first conduit330of the cell block310that spans the second primary channel322. In this regard, the first secondary channel324traverses through the second primary channel322. The first conduit330is in flow communication with a first side aperture332defined by a first side portion of the cell block310. A second side portion of the cell block310defines a second side aperture334that is in flow communication with the first primary channel320. The first secondary channel324is collectively formed by the first side aperture332, the first conduit330, the first bridge aperture326(FIG.11), and the second side aperture334. The first secondary channel324is arranged perpendicular to both the first primary channel320and the second primary channel322.

For this embodiment, the first secondary channel324is not only arranged perpendicular to both the first primary channel320and the second primary channel322, but the first secondary channel324also extends lengthwise in a same plane as the first and second primary channels320,322. Particularly, for this embodiment, the first secondary channel324extends lengthwise in a horizontal plane perpendicular to the vertical direction V as does the first and second primary channels320,322. In other embodiments, however, the first secondary channel324can be arranged perpendicular to both the first and second primary channels320,322and may extend lengthwise in a different plane than the first and second primary channels320,322extend lengthwise. As one example, the first secondary channel324can extend lengthwise in a vertical plane along the vertical direction V and the first primary channel320and the second primary channel322can both extend lengthwise in a horizontal plane perpendicular to the vertical direction V.

The cell block310also defines a second secondary channel336configured to receive the second fluid F2. The second secondary channel336has a diameter D2S (see unit cell300D inFIG.11) and spans between the first side312and the second side314of the unit cell300B along the lateral direction L. The second secondary channel336is in flow communication with the second primary channel322. Specifically, the cell block310defines a second bridge aperture338through the bridge328of the cell block310. The second bridge aperture338provides flow communication between the second primary channel322and a second conduit340of the cell block310that spans the first primary channel320. In this regard, the second secondary channel336traverses through the first primary channel320. A first side portion of the cell block310defines a first side aperture342that is in flow communication with the second primary channel322. The second conduit340is in flow communication with the second bridge aperture338and a second side aperture344(FIG.11) defined by the second side portion of the cell block310. The second secondary channel336is collectively formed by the first side aperture342, the second bridge aperture338, the second conduit340, and the second side aperture344. The second secondary channel336is arranged perpendicular to both the first primary channel320and the second primary channel322.

For this embodiment, the second secondary channel336is not only arranged perpendicular to both the first primary channel320and the second primary channel322, but the second secondary channel336also extends lengthwise in a same plane as the first and second primary channels320,322. Particularly, for this embodiment, the second secondary channel336extends lengthwise in a horizontal plane perpendicular to the vertical direction V as does the first and second primary channels320,322. In other embodiments, however, the second secondary channel336can be arranged perpendicular to both the first and second primary channels320,322and may extend lengthwise in a different plane than the first and second primary channels320,322extend lengthwise. As one example, the second secondary channel336can extend lengthwise in a vertical plane along the vertical direction V and the first primary channel320and the second primary channel322can both extend lengthwise in a horizontal plane perpendicular to the vertical direction V.

The diameters D1P, D2P of the first primary channel320and the second primary channel322are both greater than the diameters D1S, D2S of the first secondary channel324and the second secondary channel336. For instance, in some embodiments, the diameter D1P of the first primary channel320and the diameter D2P of the second primary channel D2P are both at least twice as great as the diameter D1S of the first secondary channel324and both twice as great as the diameter D2S of the second secondary channel336. In some embodiments, the diameter D1P of the first primary channel320and the diameter D2P of the second primary channel322are both at least twice as great and less than or equal to four times the diameter D1S of the first secondary channel324and twice as great and less than or equal to four times the diameter D2S of the second secondary channel336. In yet other embodiments, the diameter D1P of the first primary channel320and the diameter D2P of the second primary channel322are both at least twice as great and less than or equal to ten times the diameter D1S of the first secondary channel324and twice as great and less than or equal to ten times the diameter D2S of the second secondary channel336.

In one example embodiment, the diameters of the primary channels320,322can be twice as great as the diameters D1S, D2S of the secondary channels324,336. In another example embodiment, the diameters of the primary channels320,322can be two and a half times as great as the diameters D1S, D2S of the secondary channels324,336. In yet another example embodiment, the diameters of the primary channels320,322can be three times as great as the diameters D1S, D2S of the secondary channels324,336. In a further example embodiment, the diameters of the primary channels320,322can be four times as great as the diameters D1S, D2S of the secondary channels324,336. Unless otherwise specified, the diameters of the channels are in reference to the inner diameter of a given channel.

As depicted inFIG.11and noted above, the core222can be constructed of a plurality of unit cells300coupled with each other in flow communication. For instance, each unit cell300can be in flow communication with at least one adjacent unit cell. For example, the unit cell300B is in flow communication with at least one adjacent unit cell. Particularly, the unit cell300B is in flow communication with unit cell300A, unit cell300G, and unit cell300C, which are all adjacent to the unit cell300B.

As shown, the first primary channel320of the unit cell300B is in flow communication with the first primary channel of the unit cell300G and the second primary channel322of the unit cell300B is in flow communication with the second primary channel of the unit cell300G. The first secondary channel324of the unit cell300B is in flow communication with the first secondary channel of the unit cell300A and the first secondary channel of the unit cell300C. For instance, the first side aperture332of the unit cell300B can be in flow communication with the second side aperture of the unit cell300A and the second side aperture334of the unit cell300B can be in flow communication with the first side aperture of the unit cell C. In this way, the first secondary channel324of the unit cell300B can be in flow communication with the first secondary channels of the unit cells300A,300C. The second secondary channel336of the unit cell300B is in flow communication with the second secondary channel of the unit cell300A and the second secondary channel of the unit cell300C. For instance, the first side aperture342of the unit cell300B can be in flow communication with the second side aperture of the unit cell300A and the second side aperture334of the unit cell300B can be in flow communication with the first side aperture of the unit cell C. In this way, the second secondary channel336of the unit cell300B can be in flow communication with the second secondary channels of the unit cells300A,300C. As will be appreciated in consideringFIG.11, the channels of the other unit cells300can be in flow communication in a similar manner as provided in the example above.

Some of the unit cells300can include “dead ends”. For instance, the unit cell300A includes a dead end346associated with its first secondary channel and a dead end348associated with its second secondary channel. The dead ends346,348operate as end points for the first and second secondary channels of the unit cell300A. As depicted inFIG.11, the unit cells300E,300F, and300J all include dead ends as well.

The arrangement of the unit cells300of the core222may provide for a compact, high efficiency heat exchanger. The flow distribution grid created by the arrangement of the unit cells300may allow for enhanced heat transfer.

Specifically, the primary channels of the unit cells300allow for both fluids F1, F2to flow in counterflow direction. For instance, the arrows representing the direction of flow of the first fluid F1through the first primary channel of the unit cell300G are pointing opposite the arrows representing the direction of flow of the second fluid F2through the second primary channel of the unit cell300G.

Further, the secondary channels allow for both fluids F1, F2to flow in counterflow direction with each other and in counterflow direction within a given secondary channel. For instance, the arrows representing the direction of flow of the first fluid F1through the first secondary channel of the unit cell300G are pointing opposite the arrows representing the direction of flow of the second fluid F2through the second secondary channel of the unit cell300G at corresponding lateral locations. In this manner, the secondary channels allow for the fluids F1, F2to flow in counterflow direction with each other. Also, as shown in zoomed-in cross section A inFIG.11, the first fluid F1flowing through the first conduit may be in counterflow direction as represented by the counter-pointing arrows. Similarly, as shown in zoomed-in cross section D inFIG.11, the second fluid F2flowing through the second conduit may be in counterflow direction, as represented by the counter-pointing arrows. In this regard, the secondary channels allow for the fluids F1, F2to flow in counterflow direction within a given secondary channel.

In addition, on two diagonally-opposite sides of a given unit cell of the unit cells300, or rather on a first set of diagonally-opposite sides, the secondary channels allow for crossflow arrangements that are perpendicular to the primary channel flow. For instance, as shown in zoomed-in cross section A inFIG.11, the second fluid F2flowing through the second primary channel322(into the page as represented by the “circled X's”) is in crossflow direction with respect to the first fluid F1flowing through the first secondary channel324as represented by the arrows. Also, as shown in zoomed-in cross section D inFIG.11, the first fluid F1flowing through the first primary channel320(out of the page as represented by the “circled dots”) is in crossflow direction with respect to the second fluid F2flowing through the second secondary channel336as represented by the arrows. In this regard, the secondary channels324,336allow for crossflow arrangements that are perpendicular to the flow of fluid through the primary channels320,322. The first secondary channel324defined at least in part by the first conduit330traverses through the second primary channel322and the second secondary channel336defined at least in part by the second conduit340traverses through the first primary channel320at diagonally-opposite sides of the unit cell300G.

On the two other diagonally-opposite sides of the given unit cell of the unit cells300, or rather on a second set of diagonally-opposite sides, the junctions of the primary channels with their respective secondary channels allow for trifurcating flow arrangements. That is, at a given junction of a primary channel and secondary channel that are fluidly coupled, the fluid flows in three directions from the junction. For instance, as shown in zoomed-in cross section B inFIG.11, the first primary channel320and the first secondary channel324are directly fluidly connected at a first junction325. The first primary channel320and the first secondary channel324collectively form a trifurcating flow arrangement at the first junction325. Specifically, the first fluid F1flowing through the first primary channel320flows in a first direction from the first junction325(e.g., out of the page as represented by the “circled dot”). The first fluid F1also flows in a second direction from the first junction325through the first secondary channel324as represented by the left-pointing arrow, and the first fluid F1also flows in a third direction from the first junction325through the first secondary channel324as represented by the right-pointing arrow.

Also, as shown in zoomed-in cross section C inFIG.11, the second primary channel322and the second secondary channel336are directly fluidly connected at a second junction327. The second primary channel322and the second secondary channel336collectively form a trifurcating flow arrangement at the second junction327. More specifically, the second fluid F2flowing through the second primary channel322flows in a first direction from the second junction327(e.g., into the page as represented by the “circled X”). The second fluid F2also flows in a second direction from the second junction327through the second secondary channel336as represented by the left-pointing arrow, and the second fluid F2also flows in a third direction from the second junction327through the second secondary channel336as represented by the right-pointing arrow. Thus, the trifurcating flow arrangement at the first junction325and the trifurcating flow arrangement at the second junction327are at diagonally-opposite sides of the unit cell300G.

To summarize, the flow distribution grid created by the arrangement of the unit cells of the core may allow for enhanced heat transfer by way of the counterflows, crossflows, and trifurcating flow arrangements described above. The first and second channels224,226of the core222ofFIG.11can have any suitable cross-sectional shape, such as a circular shape, a rectangular shape, a trapezoidal shape, etc.

With reference now toFIGS.15,16,17, and18, an alternative core of an exchanger unit of the heat exchanger200will now be described. The alternative core is configured in a similar manner as the core222described above with reference toFIGS.11through14, except as provided below. Accordingly, the numerals used to identify parts of the core222ofFIGS.11through14are used to identify like or similar part of the alternative core ofFIGS.15,16,17, and18.

For this embodiment, in addition to the primary channels and the secondary channels, the core222includes or defines tertiary channels. Particularly, each unit cell300of the core222can define two tertiary channels in flow communication with the first primary channel and two tertiary channels in flow communication with the second primary channel. For the two tertiary channels in flow communication with the first primary channel, one of the tertiary channels is directly fluidly connected to the first primary channel while the other tertiary channel traverses through second primary channel and is in flow communication with the first primary channel via a first secondary channel. For the two tertiary channels in flow communication with the second primary channel, one of the tertiary channels is directly fluidly connected to the second primary channel while the other tertiary channel traverses through first primary channel and is in flow communication with the second primary channel via a second secondary channel. Each tertiary channel is arranged perpendicular to both the primary and secondary channels.

In some embodiments, the tertiary channels can extend lengthwise in a plane that is different than the plane in which the primary and secondary channels extend lengthwise. For example, the tertiary channels can extend lengthwise along the vertical direction V while the primary and secondary channels can extend in a horizontal plane that is perpendicular to the vertical direction V (e.g., the primary channels can extend lengthwise along the transverse direction T and the secondary channels can extend lengthwise along the lateral direction L). In other embodiments, the tertiary channels can extend lengthwise in a same plane as the primary channels but in a plane different than the secondary channels. For example, the tertiary channels can extend lengthwise along the lateral direction L, the primary channels can extend lengthwise along the transverse direction T, and the secondary channels can extend lengthwise along the vertical direction V.

As depicted inFIG.16, the cell block310of the unit cell300B defines two tertiary channels in flow communication with the first primary channel320. Particularly, the cell block310of the unit cell300B defines a first tertiary channel351associated with the first primary channel320. The first tertiary channel351is configured to receive the first fluid F1and is in flow communication with the first primary channel320and the first secondary channel324. The first tertiary channel351is directly fluidly connected with the first primary channel320. The first tertiary channel351has a diameter D1T (see unit cell300A inFIG.15) and spans between the top and the bottom of the cell block310along the vertical direction V.

The cell block310of the unit cell300B also defines a third tertiary channel353associated with the first primary channel320. The third tertiary channel353is configured to receive the first fluid F1and is in flow communication with the first primary channel320and the first secondary channel324. The third tertiary channel353is not directly fluidly connected with the first primary channel320, but is in fluid communication with the first primary channel320by way of the first secondary channel324. The third tertiary channel353has a diameter D3T (see unit cell300E inFIG.15) and spans between the top and the bottom of the cell block310along the vertical direction V. Notably, the third tertiary channel353traverses the second primary channel322and is directly fluidly connected to the first secondary channel324at a junction within the second primary channel322. The third tertiary channel353and the first secondary channel324form a t-shape or cross within the second primary channel322. The third tertiary channel353is arranged perpendicular to the first secondary channel324and the second primary channel322.

The cell block310of the unit cell300B depicted inFIG.16further defines two tertiary channels in flow communication with the second primary channel322. Particularly, the cell block310of the unit cell300B defines a second tertiary channel352associated with the second primary channel322. The second tertiary channel352is configured to receive the second fluid F2and is in flow communication with the second primary channel322and the second secondary channel336. The second tertiary channel352is directly fluidly connected with the second primary channel322. The second tertiary channel352has a diameter D2T (see unit cell300J inFIG.15) and spans between the top and the bottom of the cell block310along the vertical direction V.

The cell block310of the unit cell300B also defines a fourth tertiary channel354associated with the second primary channel322. The fourth tertiary channel354is configured to receive the second fluid F2and is in flow communication with the second primary channel322and the second secondary channel336. The fourth tertiary channel354is not directly fluidly connected with the second primary channel322, but the fourth tertiary channel354is in fluid communication with the second primary channel322by way of the second secondary channel336. The fourth tertiary channel354has a diameter D4T (see unit cell300A inFIG.15) and spans between the top and the bottom of the cell block310along the vertical direction V. Notably, the fourth tertiary channel354traverses the first primary channel320and is directly fluidly connected to the second secondary channel336at a junction within the first primary channel320. The fourth tertiary channel354and the second secondary channel336form a t-shape or cross within the first primary channel320. The fourth tertiary channel354is arranged perpendicular to both the second secondary channel336and the first primary channel320.

As will be appreciated based on the teachings herein, the tertiary channels of a given unit cell300can be in flow communication with a corresponding tertiary channels of an adjacent unit cell of the unit cells300. Further, it will be appreciated that the tertiary channels can be collectively formed by various apertures and conduits. For instance, as shown inFIG.16, the third tertiary channel353is formed in part by a third conduit360that spans and traverses through the second primary channel322and the fourth tertiary channel354is formed in part by a fourth conduit362that spans and traverses through the first primary channel320.

Further, in some embodiments, the diameters D1P, D2P of the first primary channel320and the second primary channel322are both greater than the diameters D1T, D2T, D3T, D4T of the tertiary channels351,352,353,354. For instance, in some embodiments, the diameter D1P of the first primary channel320and the diameter D2P of the second primary channel D2P are both at least twice as great as the diameters D1T, D2T, D3T, D4T of the tertiary channels351,352,353,354. In some embodiments, the diameter D1P of the first primary channel320and the diameter D2P of the second primary channel322are both at least twice as great and less than or equal to four times the diameters D1T, D2T, D3T, D4T of the tertiary channels351,352,353,354. In yet other embodiments, the diameter D1P of the first primary channel320and the diameter D2P of the second primary channel322are both at least twice as great and less than or equal to ten times the diameters D1T, D2T, D3T, D4T of the tertiary channels3M,352,353,354. In some embodiments, the diameters D1T, D2T, D3T, D4T of the tertiary channels351,352,353,354can all be the same diameters. In some embodiments, the diameters D1T, D2T, D3T, D4T of the tertiary channels351,352,353,354can all be the same as the diameters D1S, D2S of the secondary channels324,336.

The arrangement of the unit cells300of the core222ofFIG.15may provide for a compact, high efficiency heat exchanger200. The flow distribution grid created by the arrangement of the unit cells300may allow for enhanced heat transfer.

Specifically, the primary channels of the unit cells300allow for both fluids F1, F2to flow in counterflow direction, as noted above. Further, the secondary channels allow for both fluids F1, F2to flow in counterflow direction with each other and in counterflow direction within a given secondary channel. Likewise, the tertiary channels allow for both fluids F1, F2to flow in counterflow direction with each other and in counterflow direction within a given tertiary channel.

In addition, on two diagonally-opposite sides of a given unit cell of the unit cells300of the core222ofFIG.15, or rather on a first set of diagonally-opposite sides, the secondary channels and the tertiary channels allow for double crossflow arrangements that are perpendicular to the primary channel flow. For instance, as shown in zoomed-in cross section A inFIG.15, the second fluid F2flowing through the second primary channel (into the page as represented by the “circled X's”) is in crossflow direction with respect to the first fluid F1flowing through the first secondary channel as represented by the arrows and in crossflow direction with respect to the first fluid F1flowing through the third tertiary channel as represented by the arrows. Also, as shown in zoomed-in cross section D inFIG.15, the first fluid F1flowing through the first primary channel (out of the page as represented by the “circled dot”) is in crossflow direction with respect to the second fluid F2flowing through the second secondary channel as represented by the arrows and in crossflow direction with respect to the second fluid F2flowing through the fourth tertiary channel as represented by the arrows. In this regard, the secondary channels and the tertiary channels allow for double crossflow arrangements that are perpendicular to the primary channel flow. The first secondary channel324defined at least in part by the first conduit330and the third tertiary channel353defined at least in part by the third conduit360traverse through the second primary channel322and the second secondary channel336defined at least in part by the second conduit340and the fourth tertiary channel354traverse through the first primary channel320at diagonally-opposite sides of the unit cell300G.

On the two other diagonally-opposite sides of the given unit cell of the unit cells300of the core222ofFIG.15, or rather on a second set of diagonally-opposite sides, the junctions of the primary channels with their respective secondary channels and tertiary channels allow for pentafurcating flow arrangements. That is, at a given junction of a primary channel, a secondary channel, and a tertiary channel that are fluidly coupled, the fluid flows in five directions from the junction; hence, the pentafurcating flow arrangement. For instance, as shown in zoomed-in cross section B inFIG.15, the first primary channel320, the first secondary channel324, and the first tertiary channel351are directly fluidly connected at a first junction325. The first primary channel320, the first secondary channel324, and the first tertiary channel351collectively form a pentafurcating flow arrangement at the first junction325. Specifically, the first fluid F1flowing through the first primary channel flows in a first direction from the first junction325(e.g., out of the page as represented by the “circled dot”). The first fluid F1also flows in a second direction from the first junction325through the first secondary channel324as represented by the left-pointing arrow. The first fluid F1also flows in a third direction from the first junction325through the first secondary channel324as represented by the right-pointing arrow. Further, the first fluid F1also flows in a fourth direction from the first junction325through the first tertiary channel351as represented by the upward-pointing arrow. Finally, the first fluid F1also flows in a fifth direction from the first junction325through the first tertiary channel351as represented by the downward-pointing arrow.

Also, as shown in zoomed-in cross section C inFIG.15, the second primary channel322, the second secondary channel336, and the second tertiary channel352are directly fluidly connected at a second junction327. The second primary channel322, the second secondary channel336, and the second tertiary channel352collectively form a pentafurcating flow arrangement at the second junction327. Specifically, the second fluid F2flowing through the second primary channel322flows in a first direction from the second junction327(e.g., into the page as represented by the “circled X”). The second fluid F2also flows in a second direction from the second junction327through the second secondary channel336as represented by the left-pointing arrow. The second fluid F2also flows in a third direction from the second junction327through the second secondary channel336as represented by the right-pointing arrow. Further, the second fluid F2also flows in a fourth direction from the second junction327through the second tertiary channel352as represented by the upward-pointing arrow. Finally, the second fluid F2also flows in a fifth direction from the second junction327through the second tertiary channel352as represented by the downward-pointing arrow.

To summarize, the flow distribution grid created by the arrangement of the unit cells300of the core222ofFIG.15may allow for enhanced heat transfer by way of the counterflows, crossflows, and pentafurcating flow arrangements described above. The first primary channels, the first secondary channels, and the first and third tertiary channels of the plurality of unit cells300of the core222ofFIG.15collectively form the first channels224and the second primary channels, the second secondary channels, and the second and fourth tertiary channels of the plurality of unit cells300of the core222ofFIG.15collectively form the second channels226. The first and second channels224,226of the core222ofFIG.15can have any suitable cross-sectional shape, such as a circular shape, a rectangular shape, a trapezoidal shape, etc.

Further aspects are provided by the subject matter of the following clauses:1. A turbine engine, comprising: a compressor section, a combustion section, and a turbine section in a serial flow arrangement; and a heat exchanger, comprising: a core having a unit cell defining a first primary channel, a second primary channel, a first secondary channel in flow communication with the first primary channel, and a second secondary channel in flow communication with the second primary channel, the first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel.1a. The turbine engine of any preceding clause, wherein the compressor section, the combustion section, and the turbine section are disposed along a core air flowpath of the turbine engine, and wherein the heat exchanger is in flow communication with the core air flowpath.1b. The turbine engine of any preceding clause, wherein the compressor section, the combustion section, and the turbine section are disposed along a core air flowpath of the turbine engine, and wherein the heat exchanger is in flow communication with the core air flowpath at the compressor section.2. The turbine engine of any preceding clause, wherein the first primary channel and the second primary channel are arranged parallel to one another and the first secondary channel and the second secondary channel are arranged perpendicular to the first primary channel and the second primary channel.3. The turbine engine of any preceding clause, wherein the first primary channel and the first secondary channel are directly fluidly connected at a first junction and the second primary channel and the second secondary channel are directly fluidly connected at a second junction, and wherein the first primary channel and the first secondary channel collectively form a trifurcating flow arrangement at the first junction and the second primary channel and the second secondary channel collectively form a trifurcating flow arrangement at the second junction.4. The turbine engine of any preceding clause, wherein the trifurcating flow arrangement at the first junction and the trifurcating flow arrangement at the second junction are at diagonally-opposite sides of the unit cell.5. The turbine engine of any preceding clause, wherein the first secondary channel is defined at least in part by a first conduit that traverses through the second primary channel and the second secondary channel is defined at least in part by a second conduit that traverses through the first primary channel, and wherein the first conduit traverses through the second primary channel and the second conduit traverses through the first primary channel at diagonally-opposite side of the unit cell.6. The turbine engine of any preceding clause, wherein the first primary channel has a diameter and the second primary channel has a diameter, and wherein the diameter of the first primary channel and the diameter of the second primary channel are both greater than diameters of the first secondary channel and the second secondary channel.7. The turbine engine any preceding clause, wherein the diameter of the first primary channel and the diameter of the second primary channel are both at least twice as great and less than or equal to ten times the diameters of the first secondary channel and the second secondary channel.8. The turbine engine of any preceding clause, wherein the unit cell is one of a plurality of unit cells that form the core, the plurality of unit cells being coupled with each other in flow communication, each unit cell of the plurality of unit cells defining a first primary channel in flow communication with a first primary channel of an adjacent unit cell of the plurality of unit cells, a second primary channel in flow communication with a second primary channel of the adjacent unit cell of the plurality of unit cells, a first secondary channel in flow communication with the first primary channel and in flow communication with a first secondary channel of the adjacent unit cell, and a second secondary channel in flow communication with the second primary channel and in flow communication with a second secondary channel of the adjacent unit cell, the first secondary channel traverses through the second primary channel and the second secondary channel traverses through the first primary channel.9. The turbine engine of any preceding clause, wherein the heat exchanger further comprises a manifold having a housing and a partition wall that together define a first chamber and a second chamber, the first chamber and the second chamber being separated by the partition wall, the first chamber being in flow communication with the first primary channels of the plurality of unit cells, the manifold including a plurality of tubes that extend through the first chamber and the partition wall to provide flow communication between the second chamber and the second primary channels of the plurality of unit cells.10. The turbine engine of any preceding clause, wherein the unit cell of the core defines a first tertiary channel in flow communication with the first primary channel and the first secondary channel and defines a third tertiary channel in flow communication with the first primary channel and the first secondary channel, wherein the third tertiary channel traverses through the second primary channel, and the first tertiary channel is directly fluidly connected with the first primary channel.11. The turbine engine of any preceding clause, wherein the first primary channel, the first secondary channel, and the first tertiary channel are directly fluidly connected at a first junction, and wherein the first primary channel, the first secondary channel, and the first tertiary channel collectively form a pentafurcating flow arrangement at the first junction.12. The turbine engine of any preceding clause, wherein the unit cell of the core defines a second tertiary channel in flow communication with the second primary channel and the second secondary channel and defines a fourth tertiary channel in flow communication with the second primary channel and the second secondary channel, wherein the fourth tertiary channel traverses through the first primary channel, and the second tertiary channel is directly fluidly connected with the second primary channel.13. The turbine engine of any preceding clause, wherein the second primary channel, the second secondary channel, and the second tertiary channel are directly fluidly connected at a second junction, and wherein the second primary channel, the second secondary channel, and the second tertiary channel collectively form a pentafurcating flow arrangement at the second junction, and wherein the pentafurcating flow arrangement at the first junction and the pentafurcating flow arrangement at the second junction are at diagonally-opposite sides of the unit cell.14. The turbine engine of any preceding clause, wherein the first tertiary channel and the third tertiary channel are both arranged perpendicular to the first primary channel and to the first secondary channel, and the second tertiary channel and the fourth tertiary channel are both arranged perpendicular to the second primary channel and to the second secondary channel.15. The turbine engine of any preceding clause, wherein the first primary channel has a diameter, the second primary channel has a diameter, and the first tertiary channel, the second tertiary channel, the third tertiary channel, and the fourth tertiary channel each have diameters, and wherein the diameter of the first primary channel and the diameter of the second primary channel are both at least twice as great and less than or equal to ten times the diameters of the first tertiary channel, the second tertiary channel, the third tertiary channel, and the fourth tertiary channel.16. A heat exchanger, comprising: a core having a plurality of unit cells in flow communication with one another, each unit cell of the plurality of unit cells defining at least two primary channels and at least two secondary channels arranged perpendicular to the at least two primary channels, a first secondary channel of the at least two secondary channels traverses through a second primary channel of the at least two primary channels and is directly fluidly connected to a first primary channel of the at least two primary channels at a first junction, a second secondary channel of the at least two secondary channels traverses through the first primary channel and is directly fluidly connected to the second primary channel at a second junction.17. A heat exchanger, comprising: a core defining first channels and second channels; and a manifold having a housing and a partition wall that together define a first chamber and a second chamber, the first chamber and the second chamber being separated by the partition wall, the first chamber being in flow communication with the first channels, the manifold including a plurality of tubes that extend through the first chamber and the partition wall to provide flow communication between the second chamber and the second channels.18. The heat exchanger of any preceding clause, wherein the manifold is a first manifold, and wherein the heat exchanger further comprises: a second manifold having a housing that defines a first chamber and a second chamber separated by a partition wall, the first chamber of the second manifold being in flow communication with the first channels, the second manifold including a plurality of tubes that extend through the first chamber and the partition wall of the second manifold to provide flow communication between the second chamber of the second manifold and the second channels.19. The heat exchanger of any preceding clause, wherein the core and the manifold are components of a first exchanger unit of the heat exchanger, and wherein the heat exchanger further comprises: a second exchanger unit arranged to form an exchanger pair with the first exchanger unit, the second exchanger unit comprising: a core defining first channels and second channels; and a manifold having a housing that defines a third chamber and a fourth chamber separated by a partition wall, the third chamber being in flow communication with the first channels and the first chamber, the manifold of the second exchanger unit including a plurality of tubes that extend through the third chamber and the partition wall of the second exchanger unit to provide flow communication between the fourth chamber and the second channels, the fourth chamber being in flow communication with the second chamber of the first exchanger unit.20. The heat exchanger of any preceding clause, wherein the core and the manifold are components of a first exchanger unit of the heat exchanger, and wherein the heat exchanger further comprises: a second exchanger unit arranged to form an exchanger pair with the first exchanger unit, the second exchanger unit comprising: a core defining first channels and second channels; and a manifold having a housing that defines a third chamber and a fourth chamber separated by a partition wall, the third chamber being in flow communication with the first channels of the core of the second exchanger unit, the manifold of the second exchanger unit including a plurality of tubes that extend through the third chamber and the partition wall of the second exchanger unit to provide flow communication between the fourth chamber and the second channels of the core of the second exchanger unit, and wherein the third chamber is not in flow communication with the first chamber, and the fourth chamber is not in flow communication with the second chamber.21. The heat exchanger of any preceding clause, wherein the core and the manifold are components of a first exchanger unit of the heat exchanger, and wherein the manifold is a first manifold, and wherein the first heat exchanger further comprises a second manifold having a housing that defines a first chamber and a second chamber separated by a partition wall, the first chamber of the second manifold being in flow communication with the first channels, the second manifold including a plurality of tubes that extend through the first chamber and the partition wall of the second manifold to provide flow communication between the second chamber of the second manifold and the second channels, and wherein the heat exchanger further comprises: a second exchanger unit arranged to form an exchanger pair with the first exchanger unit, the second exchanger unit comprising: a core defining first channels and second channels; and a first manifold having a housing that defines a third chamber and a fourth chamber separated by a partition wall, the third chamber being in flow communication with the first channels of the core of the second exchanger unit, the first manifold of the second exchanger unit including a plurality of tubes that extend through the third chamber and the partition wall of the first manifold of the second exchanger unit to provide flow communication between the fourth chamber and the second channels of the core of the second exchanger unit; and a second manifold having a housing that defines a third chamber and a fourth chamber separated by a partition wall, the third chamber of the second manifold of the second exchanger unit being in flow communication with the first channels of the core of the second exchanger unit, the second manifold of the second exchanger unit including a plurality of tubes that extend through the third chamber and the partition wall of the second manifold of the second exchanger unit to provide flow communication between the fourth chamber of the second manifold and the second channels of the core of the second exchanger unit, and wherein the first chamber of the first manifold of the first exchanger unit is not in flow communication with the third chamber of the first manifold of the second exchanger unit and the second chamber of the first manifold of the first exchanger unit is not in flow communication with the fourth chamber of the first manifold of the second exchanger unit, and wherein the first chamber of the second manifold of the first exchanger unit is in flow communication with the third chamber of the second manifold of the second exchanger unit and the second chamber of the second manifold of the first exchanger unit is in flow communication with the fourth chamber of the second manifold of the second exchanger unit.22. The heat exchanger of any preceding clause, wherein the first exchanger unit has a first port allowing for flow communication into or out of the first chamber and a second port allowing for flow communication into or out of the second chamber, and wherein the second exchanger unit has a third port allowing for flow communication into or out of the third chamber and a fourth port allowing for flow communication into or out of the fourth chamber.