Patent ID: 11970985
Assignee: ROLLS-ROYCE NORTH AMERICAN TECHNOLOGIES, INC.
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 pivotably coupled to the case in the plenum to pivot about a pivot axis between a closed position in which each vane cooperates with an inner surface of the case to define the outer boundary of the gas path 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 to minimize pressure and swirl distortions in the gas turbine engine to improve stall margin for the gas turbine engine.