초록 ▼

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 thereb

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.

대표청구항 ▼

In a gas turbine engine of the type having an axis A, an annular flow path for working medium gases, a flow path for cooling fluid spaced radially from the working medium flow path and a plurality of arcuate seal segments extending circumferentially about the axis to bound the working medium flow pa

In a gas turbine engine of the type having an axis A, an annular flow path for working medium gases, a flow path for cooling fluid spaced radially from the working medium flow path and a plurality of arcuate seal segments extending circumferentially about the axis to bound the working medium flow path, the plurality of arcuate seal segments having at least one pair of arcuate seal segments which includes a first seal segment and a second seal segment that is spaced circumferentially from the first seal segment leaving a gap G therebetween that varies in size during operative conditions, the improvement which comprises: an orifice plate disposed in said gap which extends axially between the pair of segments and across the gap G and which has an opening in flow communication with the flow path for cooling fluid for directing cooling air through the orifice plate and into the radial gap G at a location which is upstream of a portion of the orifice plate with a radial component of velocity, and means for variably restricting the flow through said opening which is adapted to variably overlap said opening under operative conditions and which has a position relative to said opening which is responsive to the size of the gap G.