Patent ID: 6813877
Filing Date: 2004-11-09
Classification: F02K,Y02T

Abstract:
A gas turbine engine exhaust nozzle arrangement for the flow of exhaust gases therethrough between an upstream end and a downstream end thereof comprising a nozzle, a downstream portion and a plurality of tabs, each tab extending in a generally axial direction from the downstream portion of the nozzle wherein the nozzle further comprises an actuation mechanism capable of moving the tabs between a first deployed position, in the first position the tabs interacting with a gas stream to reduce exhaust noise thereof, and a second non-deployed position, in the second position the tabs being substantially aerodynamically unobtrusive wherein the actuating mechanism comprises a shape memory material element and wherein the tabs are rotatably attached to the nozzle with the shape memory material element having a first end and a distal end, the actuation mechanism comprises the shape memory element attached at said first end to the nozzle and attached at said distal end to said tab, such that, in use, the element in a first shape maintains the tab in the second non-deployed position.