Patent ID: 11970985
Assignee: ROLLS-ROYCE CORPORATION
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 pivotably coupled to the case in the plenum to pivot about a pivot axis between a closed position in which each vane covers a portion of the plenum to block fluid communication between the gas path and the plenum and a fully open position in which each vane is at a maximum angle relative to the gas path to provide an opening to allow fluid communication between the gas path of the gas turbine engine and the plenum, and
a control unit coupled to the plurality of vanes and configured to move each vane of the plurality of vanes between the closed position and the fully open position in response to preselected operating conditions.