Gas turbine engine variable area exhaust nozzle

摘要

A gas turbine engine variable area exhaust nozzle has a plurality of first and second movable members arranged circumferentially around a fan casing extending in downstream. The first and second movable members alternate around the variable area nozzle. During cruise conditions the first and second movable members are in un-actuated positions. At take off conditions the first movable members are in an actuated position and the second movable members are in the un-actuated position. At top of climb conditions the first movable members are in the un-actuated position and the second movable members are in an actuated position. The first movable members move radially outwardly from the un-actuated position to the actuated position and the second movable members move radially inwardly from the un-actuated position to the actuated position.

主权项

1. A gas turbine engine comprising:
a casing defining a flow passage through the gas turbine engine; a variable area nozzle being arranged at a downstream end of the casing, the variable area nozzle having a plurality of first movable members arranged around and extending in a downstream direction from the downstream end of the casing; and a plurality of second movable members arranged around and extending in a downstream direction from the downstream end of the casing, wherein the first and second movable members are arranged to define a wavy downstream end for the variable area nozzle, the wavy downstream end having peaks remotest from the downstream end of the casing and troughs nearest to the downstream end of the casing, the peaks are downstream of the troughs, the peaks and troughs are arranged alternatively around the variable area exhaust nozzle, the wavy downstream end of the variable area nozzle comprising a plurality of triangular peaks separated by the troughs, in a first mode of operation the first movable members are in an un-actuated position and the second movable members are in an un-actuated position, in a second mode of operation the first movable members are in an actuated position and the second movable members are in the un-actuated position and in a third mode of operation the first movable members are in the un-actuated position and the second movable members are in an actuated position, the first movable members are movable outwardly from the un-actuated position to the actuated position and the second movable members are movable inwardly from the un-actuated position to the actuated position, the first and second movable members being arranged alternately around the variable area exhaust nozzle, and each first movable member having a shaped downstream end to define one of the troughs at the downstream end of the variable area nozzle and each second movable member having a shaped downstream end to define one of the peaks at the downstream end of the variable area nozzle.