Aircraft wing flaps

Details Aircraft wing flaps Aircraft wing flaps

1997-05-15

1998-06-30

Grant, William

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244203, 244213, B64C 934, B64C 2306

Patent

active

057721556

ABSTRACT:
A wing assembly has a wing and at least one slender delta shaped flap with sharp leading edges pointing into the flow direction and deployable above the upper wing surface close to the quarter line of the wing for providing significantly enhanced lift and maneuverability to an aircraft. In normal flight the delta flaps are retracted into the wing such that the upper surface of the delta flaps become part of the upper surface of the wing. If higher lift is required or the wing has stalled, the delta flaps are deployed at an angle of attack into the high energy flow region outside the boundary layer of the upper wing surface, at a position relative to the wing that depends on the angle of attack of the wing. There the flaps generate strong and stable vortices at the sharp leading edges and a high pressure area between the lower surface of the delta flap and the upper wing surface resulting in a down draft and flow acceleration downstream of the flap. The infusion of high energy flow into the flow regions of the wing, where flow separation occurs, delays flow separation to significantly higher angles of attack and increases lift

REFERENCES:
patent: 1749021 (1930-03-01), Davis
patent: 2549760 (1951-04-01), Adams
patent: 4117995 (1978-10-01), Runge
patent: 4466586 (1984-08-01), Burnham
patent: 4739957 (1988-04-01), Vess et al.
patent: 4836473 (1989-06-01), Aulehla et al.
patent: 4955958 (1990-09-01), Dellinger et al.
patent: 5209438 (1993-05-01), Wygnanski
patent: 5598990 (1997-02-01), Farokhi et al.

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