US 11,732,612 B2
Turbine engine fan track liner with tip injection air recirculation passage
Daniel E. Molnar, Jr., Lebanon, IN (US); and Robert W. Heeter, Noblesville, IN (US)
Assigned to Rolls-Royce North American Technologies Inc., Indianapolis, IN (US)
Filed by Rolls-Royce North American Technologies Inc., Indianapolis, IN (US)
Filed on Dec. 22, 2021, as Appl. No. 17/560,225.
Prior Publication US 2023/0193785 A1, Jun. 22, 2023
Int. Cl. F04D 29/52 (2006.01); F01D 25/26 (2006.01); F01D 9/06 (2006.01); F01D 25/24 (2006.01); F04D 29/68 (2006.01); F01D 21/04 (2006.01)
CPC F01D 25/26 (2013.01) [F01D 9/065 (2013.01); F01D 21/045 (2013.01); F01D 25/24 (2013.01); F04D 29/526 (2013.01); F04D 29/685 (2013.01); F05D 2220/32 (2013.01); F05D 2230/60 (2013.01); F05D 2240/14 (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 fan track liner that extends circumferentially at least partway about a central axis, the fan track liner including a forward end, an aft end spaced apart axially from the forward end, and an inner radial surface that extends between the forward end and the aft end to define a gas path of the fan case assembly,
an annular case configured to support the fan track liner at a radial position relative to the central axis, the annular case including an outer wall that extends circumferentially around the central axis and a hook that extends radially inward from the outer wall and engages the forward end of the fan track liner to support the forward end of the fan track liner, and
a plurality of discrete air recirculation ducts which are not in direct fluid communication with each other and each configured to direct a portion of gases flowing through the gas path of the fan case assembly near the aft end of the fan track liner into the gas path near the forward end of the fan track liner, each air recirculation duct including
an extraction port in fluid communication with the gas path of the fan case assembly that extends radially outward from the gas path at the aft end of the fan track liner,
a conduit in fluid communication with the extraction port, the conduit extends axially forward from the extraction port toward the forward end of the fan track liner, the conduit located radially inward of the outer wall, and
an injection port in fluid communication with the gas path of the fan case assembly and the conduit, the injection port extends radially inward from the conduit toward the gas path at the forward end of the fan track liner and the hook of the annular case,
wherein the fan track liner includes a plurality of fan track liner segments arranged in circumferentially confronting relation to each other about the central axis, each air recirculation duct of the plurality of discrete air recirculation ducts is located in a gap formed circumferentially between a first fan track liner segment and a second fan track liner segment included in the plurality of fan track liner segments, and the second fan track liner segment arranged in circumferentially confronting relation to the first fan track liner segment to define the gap therebetween.