Abstract: A coolable seal assembly, having a ceramic facing material 76, such as an outer air seal 26, for a gas turbine engine is disclosed. The seal assembly is formed of an array of arcuate seal segments 24. Various construction details which enhance the ability of the seal segment to sustain a thermal shock are disclosed. The seal segment is mountable by conventional means in a rotary machine and includes circumferentially extending flanges 30, 32. The longitudinal continuity of the flanges is interrupted to decrease the effect of the flanges on the overall effective thickness and the local effective thickness of the substrate.

Abstract: A coolable seal assembly, such as the outer air seal 26, for a gas turbine engine 10 is disclosed. The seal assembly is formed of a plurality of arcuate seal segments 24 which extend circumferentially about an axis of the engine. The seal segments 24 are spaced apart leaving a clearance gap G therebetween. An orifice plate, such as the orifice plate 94, is disposed in the gap. The orifice plate has an opening, such as the orifice 106, for ducting cooling fluid into the gap G. In one embodiment, the orifice plate is integral with one of the arcuate seal segments and forms a shoulder 128 on the seal segment. Flow through the orifice plate is variably restricted by a device, such as the adjacent seal segment 24b, so that the restriction is responsive to the size of the gap G under certain operative conditions of the engine.

Abstract: A coolable stator assembly 16 for a gas turbine engine 10 is disclosed. The stator assembly includes an outer air seal 26 and an upstream support 32 and a downstream support 34 supporting the outer air seal about a flow path 14 for working medium gases. Various construction details are developed which enable impingement cooling of the outer air seal at a first location with cooling air and enable ducting a portion of the collected cooling air through the support for impingement cooling of the outer air seal at a second location. In one embodiment, metering holes 112 extend through the supports for directing the cooling air against the edge region of the outer air seal.