Title:
CASING
Document Type and Number:
Japanese Patent JPS62276202
Kind Code:
A
Abstract:
A casing (202,204), such as for a gas turbine engine (200), surrounds a fluid stream and has an unbounded fluid flowing over its external surface (212), in a downstream direction. The external surface (212) has formed therein alternating, adjoining troughs (214) and ridges (216) extending in the downstream direction to the trailing edge (210) of the casing (202,204), such that the casing (202,204) has a wave-like shape at its trailing edge (210). This construction reduces and can even eliminate boattail drag on the external surface of casings (202,204) 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.
Inventors:
PRESZ JR WALTER M (US)
PATERSON ROBERT W (US)
WERLE MIACHAEL R (US)
PATERSON ROBERT W (US)
WERLE MIACHAEL R (US)
Application Number:
JP10792287A
Publication Date:
December 01, 1987
Filing Date:
April 30, 1987
Export Citation:
Assignee:
UNITED TECHNOLOGIES CORP
International Classes:
B63B3/38; B63H9/06; B64C7/02; B64C21/10; F02C7/00; B64D29/00; B64D33/04; F01D5/14; F01D9/02; F02K1/48; F04D29/68; (IPC1-7): F01D5/14; F01D9/02; F02C7/00; F04D29/68
Attorney, Agent or Firm:
Akashi Masatake