Patent GB-1121703-A (GB)
Title: Fluid propulsion system
IPC: B63H11/12
Filed: 1965-07-16
Abstract: 1,121,703. Jet propulsion; propelling vehicles. HUYCK CORP. 16 July, 1965 [22 July, 1964], No. 30420/65. Headings B7H and B7V. [Also in Division F1] Pumping or fluid propulsion apparatus comprises a deflector 110, Fig. 3, juxtaposed to a pressurized fluid conduit 102 to define a Coanda aperture 118 therewith, the deflector, and an open-ended shroud 132 defining a convergent/divergent nozzle therebetween which has its throat 134 downstream from the aperture, the deflector surface 124 adjacent the aperture continuously receding from the axis aperture and being of parabolic shape whereby pressurized fluid passing through the aperture into the nozzle produces relative motion between the ambient fluid and the apparatus. Pressurized primary fluid e.g. steam or liquid oxygen, passes via passage 102 and on emerging from slot 118 undergoes a pressure and temperature drop. The emergent flow closely follows the curvature of parabolic segment 124. Ambient fluid flows in via inlet 106 and combines with the primary fluid and the mixed fluids pass out via diverging portion 130. Additional ambient fluid is drawn in via ports 144. The cross-section of conduit 102 may be circular, oval or annular. In a modification the external shroud (132A) Fig. 4 (not shown) is of convergent divergent configuration and the central deflector (110A) has an axial passage (111) which is tapered inwardly at its downstream end. In a further modification dual primary fluid conduits (102B), Fig. 5 (not shown) and deflectors (110B) are disposed along axes parallel to the adjacent converging wall of the shroud (132B), the diverging portion (130B) of which has additional ambient fluid ports (144B) immediately downstream of the neck. In a further modification dual primary fluid conduits (102C), Fig. 6, (not shown) emerge from a single header conduit (142C) which enters the shroud wall (132C) perpendicularly. The deflectors (110C) are parallel to the flow axis through the shroud (132C) which is similar to shroud 132, Fig. 2. Additional ambient fluid is admitted via a central tube (146C) having a ring of ports (144C) downstream of the primary fluid slots (118C). Fluid may be delivered by a fluid feed duet which forms a continuous passage with the shroud (132C). In a further modification additional ambient fluid is admitted from vents (144D) Fig. 7 (not shown) in a central tube passing coaxially through a deflector (110D) in a convergent/ divergent shroud (132D). Figure 9. In another embodiment the primary fluid passes via channels 102E and chamber 107E to emerge via slot 118E to create a pressure reduction in neck 134E. Ambient fluid enters holes 105E and passes via convergent portion 126E into neck 134E where it is entrained with the primary fluid and passes to outlet 108E. An additional stream of pressurized fluid enters via inlet 150E, annular chamber 152E and apertures 144E. In another embodiment for ship propulsion the primary fluid is admitted through internal and external Coanda slots 226, 283, Fig. 12 and additional primary fluid is admitted through an annular slot 290 downstream of the neck of the nozzle to assist the propulsive effect. The sizes of the Coanda slots are adjustable. In a further embodiment arcuate pressure fluid distributers 298, Fig. 15, are disposed in shrouds 291, 292 along the sides of the ship's hull so as to form convergent/divergent nozzles therewith. Steam passes via conduits 296 to emerge from Coanda slots 302 thereby entraining water which passes through the nozzles to effect propulsion. Additional water may be admitted through apertures (320) Fig. 16 (not shown) situated downstream of the nozzle neck (304). The apparatus may be used for propulsion of land vehicles, aircraft, submarines, torpedoes, surface vessels or for pumping paper slurry, grain or snow.