Patent ID: 11965528
Assignee: ROLLS-ROYCE NORTH AMERICAN TECHNOLOGIES, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 10:
11. A gas turbine engine comprising:
a fan including a fan rotor configured to rotate about an axis of the gas turbine engine and a plurality of fan blades coupled to the fan rotor for rotation therewith,
a fan case assembly that extends circumferentially around the plurality of fan blades radially outward of the plurality of fan blades, the fan case assembly comprising
a case that extends circumferentially at least partway about the axis, the case formed to define a plenum that extends circumferentially at least partway about the axis and is open to a 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 relative to the case to move between a closed position in which the movable closure covers the plurality of inlet openings to the plenum and an open position in which a plurality of slots in the movable closure are aligned with the plurality of inlet openings, and the control unit configured to move the movable closure between the closed position and the open position in response to preselected operating conditions.