Method of and apparatus for enhancing Coanda flow attachment ove

Details Method of and apparatus for enhancing Coanda flow attachment ove Method of and apparatus for enhancing Coanda flow attachment ove

1975-08-28

1977-04-26

Kunin, Stephen G.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244 40A, 244 42CC, B64C 2100

Patent

active

040196968

ABSTRACT:
A method of enhancing Coanda flow attachment over a wing and flap surface of an upper surface blowing aircraft comprising the step of directing the jet exhaust flow or stream toward regions wherein the exhaust flow separates from the wing and flap surface so as to create an outward velocity component which prevents ambient air from flowing in and under the exhaust from the sides of the exhaust flow and causing such separation is disclosed. The method comprises the further step of creating vortices also having outward velocity components on the wing and flap surface. The outward velocity components of the vortices further increases the sidewise velocity component on the wing surface. In addition, the rotational velocity components of the vortices scrub the boundary layer air from the flap surface to further promote flow attachment. Apparatus suitable for carrying out the method and comprising a plurality of airfoil shaped vortex generating vanes located between the engine exhaust and the trailing edge of the flap is also disclosed. The vortex generating vanes direct the exhaust stream toward the separation regions and create the outward velocity component vortices.

REFERENCES:
patent: 2740596 (1956-04-01), Lee
patent: 2800291 (1957-07-01), Stephens
patent: 2991961 (1961-07-01), Rogallo et al.
patent: 3018983 (1962-01-01), Davidson
patent: 3578264 (1971-05-01), Koethe
patent: 3837601 (1974-09-01), Cole

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