Blade clearance control for turbomachinery

摘要

A system includes a gas turbine engine (30) having a shroud (130) and a rotor (120) with one or more blades (126, 127). The rotor rotates within the shroud to pressurize a fluid during operation of the engine. An electromagnetic actuator (50) is also included that is operable to move the shroud relative to the rotor to adjust clearance between the shroud and blades. A controller (40) is included in this system to determine a desired amount of clearance in accordance with an operating mode of the engine. The controller generates an actuation signal to change the clearance in correspondence with the desired amount. The electromagnetic actuator responds to the actuation signal to provide the desired amount of clearance.