초록 ▼

A variable exhaust nozzle (26) for a turbine engine nacelle (16) includes a pair of semi-cowls (58, 60) disposed about a longitudinally extending central axis (14) and a pair of corresponding shells (36, 38) each of which is spaced radially inwardly from the corresponding semi-cowl and is pivotable

A variable exhaust nozzle (26) for a turbine engine nacelle (16) includes a pair of semi-cowls (58, 60) disposed about a longitudinally extending central axis (14) and a pair of corresponding shells (36, 38) each of which is spaced radially inwardly from the corresponding semi-cowl and is pivotable about a pivot axis (42, 44) between an extended position and a retracted position. The semi-cowls and shells have curved, geometrically similar inner and outer surfaces (86, 100) respectively so that gap (108) between the shells and the cowl is uniform irrespective of the angular orientation of the shells. A seal (128) which includes longitudinally extending legs (128a, 128b) and an optional circumferential leg (128c) prevents detrimental air leakage. Pivotal movement of the shells effects large changes in the discharge area A.sub.D of the nozzle without compromising the external aerodynamic characteristics of the nacelle. In one embodiment of the invention, each shell includes an extension (110) which facilitates the attainment of large area changes. The radial uniformity of gap (108) contributes to the durability and simplicity of the seal by ensuring that the seal is not repeatedly compressed and relaxed during operation of the nozzle.

대표청구항 ▼

[ We claim:] [1.] An exhaust nozzle for a turbine engine, comprising:a cowl disposed about a longitudinally extending central axis and comprising two semi-cowls, each semi-cowl having an outer surface and an inner surface joined together at a cowl trailing edge, a portion of each semi-cowl inner sur

[ We claim:] [1.] An exhaust nozzle for a turbine engine, comprising:a cowl disposed about a longitudinally extending central axis and comprising two semi-cowls, each semi-cowl having an outer surface and an inner surface joined together at a cowl trailing edge, a portion of each semi-cowl inner surface being a first curved surface having an generating axis which is perpendicular to the central axis and located longitudinally forwardly of the cowl trailing edge; anda pair of shells each corresponding to one of the semi-cowls, each shell including a panel having a leading edge, a trailing edge, an inner surface and an outer surface, each panel being pivotable about a pivot axis substantially coincident with the corresponding generating axis between an extended position and a retracted position, each panel outer surface being a second curved surface spaced radially inwardly from the corresponding semi-cowl inner surface thereby defining a uniform gap between each panel outer surface and the corresponding semi-cowl inner surface.