Patent ID: 9435203
Filing Date: 2016-09-06
CPC Classification: F01C,F01D

Claim Text:
1. A gas turbine engine comprising a rotary positive displacement machine with interengaging rotors, adapted to handle a working fluid by rotation of the rotors through rotary cycles, the machine comprising: a casing structure comprising two or more intersecting bores, at least two of which bores have different radial dimensions relative to one another, the casing further including at least one high pressure port for the flow therethrough of working fluid at high pressure, and at least one low pressure port for the flow therethrough of the working fluid at lower pressure; rotors, each mounted for rotation in one of said intersecting bores with axes for rotation substantially parallel with one another, each rotor comprising at least one radially extending lobe having peripheral, radially-extended surfaces which define close-clearance or sealing interfaces with inner surfaces of each bore within which each rotor is mounted for rotation; such that each lobe on each rotor mounted in one size of said bores has lobes that have a smaller radial extent measured from the hub of its respective rotor to a farthest extremity of the lobe, compared to a larger radial extent of each lobe on each rotor mounted in the other size of said bores, thus to provide said close-clearance or sealing interfaces, each rotor also comprising at least one pit into which to receive a lobe of an adjacent rotor during an interengaging portion of each rotary cycle; and timing gear means constraining said rotors to rotate in timed, interengaging relation in said intersecting bores, with adjacent rotors rotating in opposite directions such that the lobes and pits of adjacent rotors interengage as the rotors rotate, wherein the high pressure port comprises an injector for injecting a combustable fuel or fuel/air mixture, into the engine wherein ignition of the injected fuel causes rapid heating with an increase in volume and/or pressure of the fluid within the casing to force the lobes of adjacent rotors apart, thereby to turn adjacent rotors in opposite directions.