United Technologies Corporation

Donald E Haddad

Daniel E Kane

James R Murdock

Matthew Stahl

Emilio Pereiras, Jr

A shroud segment for a gas turbine engine includes a rail engaged with adjacent support structure to retain the segment and to provide sealing between the segment and the adjacent structure. Various construction details are disclosed which provide an effective sealing and retaining feature that permits differing thermal growth between the segment and the support structure. In a particular embodiment, a shroud segment includes a rail along a forward edge. The rail is engaged with a recess in the support structure to retain the segment and with a band which positions the segment and seals the forward edge.

Mounting and sealing arrangement for a turbine shroud segment

A coolable outer air seal assembly for a gas turbine engine is disclosed. Various construction details are developed which provide an outer air seal assembly comprised of a plurality of seal segments including bumpers adapted to maintain adequate cooling fluid flow through the clearance gap between adjacent seal segments. In one particular embodiment, each seal segment includes a mating surface having a plurality of bumpers disposed adjacent to cooling fluid channel outlets and an axially extending ridge disposed along the radially outer edge of the mating surface. The bumpers extend circumferentially a distance H.sub.b to maintain a minimum opening G.sub.min between adjacent seal segments and extend a radial distance W.sub.b to restrict fluid from flowing axially through the clearance gap. The ridge extends radially outward to define in part a seal edge for engaging a feather seal.

Coolable outer air seal assembly for a gas turbine engine

A method for controlling radial clearance in a gas turbine engine (10) uses a mathematical algorithm to synthesize the current clearance .delta., including the transient effects of prior engine operations. The synthesized clearance is compared (202) to a schedule of desired clearance (206) for closing .delta. a cooling air modulating valve (44) as required to avoid rubbing between the rotating blade tips and surrounding shroud.

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Amston, CT, United States of America

Donald E Haddad