MULTI-STAGE TURBINE INTERSTAGE SEAL AND METHOD OF ASSEMBLY

摘要

A sealing system for a multi-stage turbine 12 includes multiple interstage seal segments 54 disposed circumferentially about a turbine rotor wheel assembly and extending axially between a forward turbine stage 52 and an aft turbine stage 53. Each of the interstage seal segments 54 includes a forward end portion including an outer seal surface 96 and an inner support face 98, an aft end portion 58, including an outer seal surface 96 and an inner support face 98 and a main body portion 62 extending axially from the forward end portion 57 to the aft end 58. The main body portion 62 includes at least two support webs 59 coupling the outer seal surfaces and the inner support faces. The outer seal surfaces 96 are configured to be retained in a radial direction by a land support on each of a forward and aft stage turbine buckets, such that substantially all the centrifugal load from the multiple interstage seal segments 54 is transferred to the forward and aft stage turbine buckets. A method of assembling the sealing system is disclosed.