Terraced channels for reducing afterbody drag

Details Terraced channels for reducing afterbody drag Terraced channels for reducing afterbody drag

1984-10-15

1988-01-12

Barefoot, Galen

Aeronautics and astronautics

Aircraft structure

Details

244199, 244200, B64C 138

Patent

active

047186208

ABSTRACT:
A fluid flow control for reducing the drag associated with an upswept afterbody includes a pair of ridges forming substantially symmetric flow channels arranged in an approximately helical fashion on either side of the afterbody so as to intersect at approximately the centerline of the undersurface. Each ridge has a generally rearward pitch so that the flow channels form a substantially V-shaped configuration rearwardly. The flow channels cross the local fluid flow streamlines at an optimum angle for producing a strong vortex core along the channel length with the vortex rotating in a direction counter to that normally found in the wake of conventional upswept afterbodies.

REFERENCES:
patent: 1554843 (1925-09-01), Daynix
patent: 2800291 (1957-07-01), Stephens
patent: 3419232 (1968-12-01), McStay et al.
patent: 3578264 (1971-05-01), Kuethe
patent: 4455045 (1984-06-01), Wheeler

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