Turbine mit einer statischen Dichtung

摘要

In a gas turbine having a chordal hinge seal between an inner rail (52) of each nozzle segment and an annular axially facing sealing surface (54) of a nozzle support ring (44), a supplemental seal (70) is disposed between the support ring and inner rail (52) of the nozzle segment on a high pressure side of the chordal hinge seal. The supplemental seal includes a pair of sheet metal shims (72, 74) overlaid by a woven metallic cloth (76). A bracket (80) and a portion of the supplemental seal are received in a groove (86) along a radial inward facing surface (88) of the inner rail. The projecting margin of the cloth seal bears against the annular sealing surface (54) of the nozzle support ring. The shims of the distal margin (84) of the supplemental seal are slit and staggered in a chord-wise direction relative to one another to provide flexibility and effective sealing engagement with the nozzle support ring.