Patent ID: 11965528
Assignee: ROLLS-ROYCE CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A fan case assembly adapted for use with a gas turbine engine, the fan case assembly comprising:
a case that extends circumferentially at least partway about an axis to define an outer boundary of a gas path of the gas turbine engine, the case formed to define a plenum that extends circumferentially at least partway about the axis and is open to the gas path of the gas turbine engine,
a plurality of vanes arranged in the plenum and spaced apart circumferentially about the axis to define a plurality of inlet openings in fluid communication with the plenum, and
an inlet distortion mitigation system including a movable closure mounted for movement relative to the case and a control unit, the movable closure configured to rotate about the axis relative to the case to move between a closed position in which the movable closure covers the plurality of inlet openings to the plenum to block fluid communication between the gas path and the plenum and an open position in which a plurality of slots in the movable closure are aligned with the plurality of inlet openings to allow fluid communication between the gas path and the plenum, and the control unit configured to move the movable closure between the closed position and the open position in response to preselected operating conditions to minimize negative effects of pressure and swirl distortions in the gas turbine engine to improve stall margin for the gas turbine engine.