GAS TURBINE INCLUDING SEAL STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a gas turbine which has a seal structure capable of maintaining a sealing property of the seal structure and capable of improving service life of a member of the seal structure by reducing stress concentration around a disc engaging part.SOLUTION: A gas turbine includes: a projection part which is arranged between a plurality of rotor discs arrayed in a rotor axial direction, which extends in the rotor axial direction so as to oppose with each other from an adjacent rotor disc and in which an annular groove part is formed on an opposing end surface; an annular seal plate which is arranged in a rotor circumferential direction in the groove part, and in which a seal plate engaging part is formed on a side edge; and a rotation stop member which is locked to the projection part via a disc engaging part formed at the projection part, and which locks the seal plate via the seal plate engaging part. The projection part is an annular projecting part in which tips in the rotor axial direction are sandwiching the groove part, and a stress relaxation part which is adjacent to the disc engaging part in the rotor circumferential direction is provided at the projecting part. The stress relaxation part is arranged so as to overlap the seal plate in a rotor radial direction.