Bodies with reduced base drag

Details Bodies with reduced base drag Bodies with reduced base drag

1986-12-29

1988-12-06

Barefoot, Galen

Aeronautics and astronautics

Aircraft structure

Details

2961801, 2961804, B64C 138

Patent

active

047891173

ABSTRACT:
A body adapted to move downstream through a fluid has a downstream extending smooth surface terminating at a blunt base. A plurality of adjacent U-shaped, downstream extending troughs in the smooth surface intersect the blunt base to form trough outlets. The troughs are appropriately spaced apart, sized and configured to flow full over their entire length and cause fluid to flow into the space immediately behind the blunt base, thereby reducing base drag on the body.

REFERENCES:
patent: 1366635 (1921-01-01), Conway
patent: 2074201 (1937-03-01), Bechereau
patent: 2238749 (1941-04-01), Peltier
patent: 2962101 (1960-11-01), Vaghi
patent: 3072368 (1963-01-01), Seddon et al.
patent: 3434425 (1969-03-01), Critcher
patent: 3481531 (1969-12-01), MacArthur et al.
patent: 3776363 (1973-12-01), Kuethe
patent: 3873048 (1975-03-01), Platou
patent: 4343506 (1982-08-01), Saltzman
"Axisymmetric Bluff Body Drag Reduction Through Geometrical Modification", by Howard and Doodman, Journal of Aircraft, vol. 22, #6, 6/85.
"Longitudinal Grooves for Bluff Body Drag Reduction", by Howard, Quass, Weinstein and Bushnell, AIAA Technical Note 81-4095, vol. 19, No. 4, Apr. 1981.

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