Bodies with reduced surface drag

Details Bodies with reduced surface drag Bodies with reduced surface drag

B - Operations, Transporting

64

D

244/101, 60/93,

B64D 29/00 (2006.01) B63B 3/38 (2006.01) B63H 9/06 (2006.01) B64C 7/02 (2006.01) B64C 21/10 (2006.01) F02K 1/48 (2006.01)

Patent

CA 1324999

Abstract of the Disclosure Bodies with Reduced Surface Drag A casing, such as for a gas turbine engine, surrounds a fluid stream and has an unbounded fluid flowing over its external surface in a downstream direction. The external surface has formed therein alternating, adjoining troughs and ridges extending in the downstream direction to the trailing edge of the casing, such that the casing has a wave-like shape at its trailing edge. this construction reduces and can even eliminate boattail drag on the external surface of casings by delaying or eliminating the onset of two-dimensional boundary layer separation. Shorter length casings with greater convex curvature may be used with less drag penalty.

533578

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