Turbine shroud segment and shroud assembly

Abstract

A turbine engine shroud segment, preferably a low ductility material, for example a ceramic matrix composite, comprises a segment body extending between body circumferential ends. The body includes a body radially inner surface arcuate at least circumferentially, and a body radially outer surface from which a plurality of hooks extend generally radially outwardly. Each hook comprises a generally radially outwardly extending hook arm with a generally axially extending hook end having a generally radially inner surface in spaced apart juxtaposition with a portion of the body radially outer surface. Such body outer surface includes at least two body contact surfaces each matched in shape and in juxtaposition at least at body circumferential ends with a cooperating hanger contact surface. The radially inner surface of each hook end includes a hook end contact surface matched in shape with a cooperating hanger contact surface at least in a circumferential middle portion of such surface. In a turbine engine shroud assembly, a plurality of such shroud segments are assembled circumferentially with a shroud hanger including at least one hanger foot assembled within and between the segment hooks. The hanger foot includes a plurality of spaced apart hanger foot contact surfaces cooperating in juxtaposition with the contact surfaces of the shroud segment body radially outer surface and the hook end radially inner surfaces. The various contact surfaces cooperating in juxtaposition are matched in shape each to define a fluid choke therebetween.