Patent ID: 11946379
Assignee: ROLLS-ROYCE NORTH AMERICAN TECHNOLOGIES, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 7:
8. A fan case assembly adapted for use in a gas turbine engine, the fan case assembly comprising:
a fan track liner that extends circumferentially at least partway about a central axis to define a portion of a gas path, the fan track liner including a forward end and an aft end spaced apart axially from the forward end,
an annular case coupled with the fan track liner, and
an air recirculation duct including
extraction ports spaced circumferentially about the central axis and in fluid communication with the gas path, each of the extraction ports extending radially through the annular case near the aft end of the fan track liner, and each of the extraction ports opens directly into the gas path exposed to the fan track liner,
a first injection port in fluid communication with the gas path, the first injection port extending radially through the annular case near the forward end of the fan track liner, and the first injection port opens directly into the gas path exposed to the fan track liner, and
a manifold in fluid communication with the extraction ports and the first injection port that extends from the extraction ports to the first injection port and the manifold is located radially outward of the annular case,

wherein the annular case includes an outer wall that extends circumferentially around the central axis of the gas turbine engine, the outer wall formed to define aft holes spaced apart circumferentially about the central axis that each extend radially through the entire outer wall and a forward hole that extends radially through the entire outer wall at a location axially forward of the aft holes, and
wherein each of the extraction ports extends through one of the aft holes and the first injection port extends through the forward hole.