System and method to exhaust spent cooling air of gas turbine engine active clearance control

摘要

An exemplary thermal air exhaust system (124) includes circumferentially extending exhaust passages (126) to exhaust thermal control air (36) from an annular region (128) between an outer casing (66) and a distribution manifold (50) encircling an axially extending portion of the casing (66) after the thermal control air (36) has been sprayed on at least one thermal control ring (84) attached to the outer casing (66) and/or onto the outer casing (66) by spray tubes (60) with spray holes (1). Baffles (130) attached to base panels (58) of the distribution manifold (50) and contoured to form the exhaust passages (126) between the baffles (130) and base panels (58). The exhaust passages (126) having exhaust passage inlets (134) formed by radially facing exhaust holes (136) through the baffles (130) and exhaust passage outlets (138) formed by circumferentially facing exhaust passage outlets (138) between the baffles (130) and the base panels (58). Thermal control air (36) is sprayed on at least one thermal control ring (84) and/or onto the outer casing (66) and then circumferentially exhausted through the exhaust passages (126).