Convoluted plate to reduce base drag

Details Convoluted plate to reduce base drag Convoluted plate to reduce base drag

1987-11-05

1988-10-11

Barefoot, Galen L.

Aeronautics and astronautics

Aircraft structure

Details

244199, 2961801, 2961804, B64C 138

Patent

active

047765356

ABSTRACT:
A body adapted to move downstream through a fluid has a downstream extending smooth surface terminating at a blunt base. Extending transversely across the smooth surface and disposed upstream of the blunt base is a thin, downstream extending plate closely spaced from the smooth surface. At least the downstream end portion of the plate is convoluted such that its downstream end is wave shaped. The convolutions are designed to generate pairs of counterrotating vortices which delay boundary layer separation from the smooth surface and cause fluid to flow into the space immediately behind the blunt base, reducing base drag on the body. The device generates very little drag of its own.

REFERENCES:
patent: 2800291 (1957-07-01), Stephens
patent: 3999797 (1976-12-01), Kirsch et al.
patent: 4688840 (1987-08-01), Kretschmer
patent: 4706910 (1987-11-01), Walsh et al.
"The Reduction of Drag by Corrugating Trailing Edges", paper by D. L. Whitehead et al., Cambridge Univ., England, 1982.

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