Variable area exhaust nozzle for a gas turbine engine

Details Variable area exhaust nozzle for a gas turbine engine Variable area exhaust nozzle for a gas turbine engine

1987-08-17

1989-04-18

Barefoot, Galen

Aeronautics and astronautics

Aircraft, heavier-than-air

Fluid sustained

244 125, 244 52, 244 53R, 60232, 23926533, B64C 1502

Patent

active

048219797

ABSTRACT:
A nozzle for a gas turbine engine having a first fixed petal 44 and a second movable petal 46 which is pivotally mounted at a point intermediate its leading edge 46(a) and its trailing edge 46(b). Actuation means 48 are provided to move the nozzle between a first and a second position. In the petals first position, its leading edge 46(a) is positioned forward of and slightly radially inward of the trailing edge 50 of the exhaust duct 52, such that a small ejector gap 54 is provided therebetween and the trailing edge 46(b) approaches the trailing edge 44(b) of the fixed petal, such that the gap therebetween defines the exit area of the nozzle 36. In the petals second position (shown dotted), its leading edge 46(a) is moved radially inwards of its trailing edge 46(b) such that the exit area of the nozzle is defined by the area between the trailing edge 50 of the exhaust duct 52 on the second petal side and the trailing edge of the first petal 44(b). An ejector gap 56 is also provided on the fixed petal side and acts to aid the flow of air over the outside surfaces of the petals.

REFERENCES:
patent: 2625008 (1953-01-01), Crook
patent: 2734698 (1956-02-01), Straayer
patent: 3347466 (1967-10-01), Nichols
patent: 3386248 (1968-06-01), Pike et al.
patent: 3398896 (1968-08-01), Rabone
patent: 3774868 (1973-11-01), Goetz
patent: 3863867 (1975-02-01), Soustin
patent: 3986687 (1976-10-01), Beavers
patent: 4175385 (1979-11-01), Nash
patent: 4714197 (1987-12-01), Thayer et al.

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