US 12,258,870 B1
Adjustable fan track liner with slotted array active fan tip treatment for distortion tolerance
Daniel E. Molnar, Jr., Indianapolis, IN (US); Robert W. Heeter, Indianapolis, IN (US); and Jonathan M. Rivers, Indianapolis, IN (US)
Assigned to Rolls-Royce North American Technologies Inc., Indianapolis, IN (US); and Rolls-Royce Corporation, Indianapolis, IN (US)
Filed by Rolls-Royce North American Technologies Inc., Indianapolis, IN (US); and Rolls-Royce Corporation, Indianapolis, IN (US)
Filed on Mar. 8, 2024, as Appl. No. 18/600,620.
This patent is subject to a terminal disclaimer.
Int. Cl. F04D 29/68 (2006.01); F01D 11/08 (2006.01); F01D 17/12 (2006.01); F04D 29/52 (2006.01); F01D 11/22 (2006.01)
CPC F01D 17/12 (2013.01) [F01D 11/08 (2013.01); F04D 29/526 (2013.01); F04D 29/685 (2013.01); F01D 11/22 (2013.01); F05D 2220/32 (2013.01); F05D 2240/12 (2013.01); F05D 2260/60 (2013.01)] 20 Claims
OG exemplary drawing
 
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 a central axis of the fan case assembly 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 central axis,
a plurality of drums arranged in the plenum and spaced circumferentially about the central axis, each drum of the plurality of drums shaped to include a slot that extends through the corresponding drum, each drum of the plurality of drums configured to rotate about a respective drum axis between a closed position in which the slot of the corresponding drum extends circumferentially relative to the central axis to close off the slot from the gas path to block fluid communication between the gas path and the plenum through the slot and a fully open position in which the slot of the corresponding drum extends radially relative to the central axis to open the slot to the gas path to allow fluid communication between the gas path and the plenum through the slot, and
a control unit configured to rotate the plurality of drums about the respective drum axis between the closed position and the fully open position in response to preselected operating conditions to minimize negative effects pressure and swirl distortions in the gas turbine engine to improve stall margin.