Patent ID: 8257021

Claim:
A gas-turbine engine comprising: an outer casing; an inner casing; a plurality of stator vanes mounted within the inner casing so as to be angularly variable about respective longitudinal axes; at least one actuating element connected to the plurality of stator vanes for angularly varying the stator vanes about their longitudinal axes in order to control an airflow supplied to downstream rotor blades; wherein the at least one actuating element is arranged in downstream, confined stages of at least one of a compressor or a turbine and enclosed by the inner casing and the outer casing, with the stages being exposed to high temperatures, and that the at least one actuating element is fixed to the inner casing and outer casing and made of a material that at least one of expands, contracts and deforms in dependence of a temperature prevailing in respective stages, thereby transmitting a temperature-dependent change in at least one of shape and length to the stator vanes linked to the at least one actuating element; wherein the at least one actuating element is linked to one of a forward end aortion and a rearward end portion of one of the stator vanes and the other of the forward end portion and the rearward end portion of the stator vane is flexibly held on the inner casing.