COOLING AIR SUPPLY STRUCTURE OF GAS TURBINE AND GAS TURBINE

摘要

A cooling air supply structure of a gas turbine comprises an introduction passage (324) provided in a turbine stationary blade (32) secured in a turbine casing (31) to interconnect the inside and outside thereof, a rotor cavity (334) provided on the rotor side and having an opening along the circumferential direction of the rotor, a nozzle (326) provided in the inner circumferential portion of the turbine stationary blade in a mode communicating with the introduction passage while directing a discharge port to the opening of the rotor cavity and having a swirler (327) at the discharge port, a brush seal (328a) provided between the turbine stationary blade and the rotor side, a cooling passage (336) secured to the rotor to rotate together therewith and provided in a disc (333) for securing a turbine rotor blade (33), and a pressurization passage (337) interconnecting the cooling passage and the rotor cavity, wherein the discharge port of the nozzle and the connection mouth (337a) of the rotor cavity to the pressurization passage are arranged at equal distance (r) from the central axis of the rotor in the radial direction.