Air foil providing vortex attenuation

Details Air foil providing vortex attenuation Air foil providing vortex attenuation

1993-03-15

1994-03-29

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244 90R, B64C 2306

Patent

active

052977641

ABSTRACT:
An airfoil (24) providing vortex attenuation includes an outboard area (28). The outboard area has a foil extension portion (30) having a high pressure surface (32). The high pressure surface has an arcuate shape that increases in length from a leading edge (36) to a trailing edge (38) of the airfoil. The outboard area further includes an orifice portion (40) with an opening (42) therein. The opening in the orifice portion has a swirler (44) mounted therein. The swirler and the high pressure surface cause the air passing under the wing toward the outboard area to rotate with controlled direction and velocity consistent with the rotational direction of a naturally occurring vortex at the outboard area of the wing. As a result, the natural tip vortex is attenuated reducing drag on the airfoil.

REFERENCES:
patent: 3090584 (1963-05-01), Kuchemann et al.
patent: 3692259 (1972-09-01), Yuar
patent: 3997132 (1976-12-01), Erwin
patent: 4108403 (1978-08-01), Finch
patent: 4132375 (1979-01-01), Lamar
patent: 4485992 (1984-12-01), Rao
patent: 5150859 (1992-09-01), Ransick

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