Patent ID: 8177483

Claim:
A gas turbine with a clearance control system, comprising: a rotor with at least one stage of rotor blades; a casing structure, said rotor housed within said casing structure, said casing structure including a stationary outer casing and an inner shroud associated with each said stage of rotor blades, said inner shroud displaceable relative to said outer casing; a plurality of actuators contained within said outer casing and circumferentially spaced around said shroud and radially connecting said shroud to said outer casing, said plurality of actuators configured to eccentrically displace said shroud relative to said outer casing; a plurality of sensors circumferentially spaced around said shroud and configured to measure a parameter indicative of an eccentricity between said rotor and said shroud as said rotor rotates within said shroud; and a control system in communication with said plurality of sensors and said plurality of actuators and configured to control said plurality of actuators to eccentrically displace said shroud to compensate for eccentricities detected between said rotor and said shroud by said plurality of sensors.