Aeronautics and astronautics – Aircraft power plants
Patent
1977-04-29
1979-11-13
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft power plants
115 75, 137 151, 244199, B64D 3302
Patent
active
041740831
ABSTRACT:
To enhance the flow of air into a flush-type, air inlet on the fuselage of an aircraft, a wing-like deflector is mounted on a pedestal attached to the aircraft and is positioned outwardly from the fuselage and forwardly of the inlet so as to deflect free stream air flowing past slower-moving boundary layer air adjacent the fuselage, into the inlet. The deflector has an ogee shaped planform and is pitched at a predetermined angle of attack with respect to the direction of free stream flow to generate counterrotating flow vortices that trail the deflector and produce a strong downwash behind the deflector. The vortices entrain high energy air from the free stream and direct it down into the inlet. In one disclosed embodiment, the inlet is equipped with a door that swings between a closed position, flush with the exterior of the fuselage to block air flow from entering the inlet, and an open position, recessed within the inlet duct. The flow deflector is mounted on the door and is moveable therewith so that when the door is open, the deflector is oriented at the proper angle of attack for causing the downwash to flow into the open inlet, and so that when the door is closed, the deflector is generally parallel to the air flow to minimize drag. In another disclosed embodiment, the deflector is articulated independently of the inlet door to enable the angle of attack to be independently adjusted, and in still a further embodiment a downwardly angulated trailing edge flap is added to the ogee shaped deflector for augmenting the downwash.
REFERENCES:
patent: 2298040 (1942-10-01), Davis
patent: 2694357 (1954-11-01), Lee
patent: 2997257 (1961-08-01), Kerry
patent: 3033491 (1962-05-01), Clark
patent: 3222863 (1965-12-01), Klees et al.
patent: 3807663 (1974-04-01), Bartoe, Jr.
patent: 3940097 (1976-02-01), Wilson
McCormick, "Aerodynamics d V/STOL Flight", Academic Press, 1967, pp. 169, 177.
Barefoot Galen L.
The Boeing Company
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