Flow sleeve with tabbed direct combustion liner cooling air

摘要

A combustion duct for a gas turbine engine has a combustion liner (3 1) to receive products of combustion, and deliver the products of combustion downstream toward a turbine rotor. An outer housing (22) is positioned radially outwardly of the combustion liner (31). A flow sleeve (32) is positioned radially intermediate the outer housing (22) and the combustion liner (31). A chamber (30) radially outwardly of the flow sleeve (32) receives cooling air. A plurality of holes (35) through the flow sleeve deliver cooling air from the chamber (30) against an outer periphery of the combustion liner (31). A plurality of tabs (40) are associated with at least some of the holes (35) in the flow sleeve (32). The tabs (40) are positioned to extend radially inwardly on a downstream side of the holes (35).