Gas turbine

摘要

Provided is gas turbine having cooling structure disposed on outside peripheral side in radius direction of movable vane in which cooling efficiency is further improved and sealing structure disposed on inside peripheral side in which leakage of sealing air is suppressed to prevent invasion of combustion gas into turbine disc and enlargement of sealing air clearance is prevented. Outside in radius direction, gap between ring segment 90 and impingement cooling plate 92 disposed on outside periphery thereof is divided in the axial direction by pressure partition plate 97 extending in circumferential direction so as to provide plural cavities adjusted to different pressures, thereby constructing cooling structure in the ring segment 90. Inside in radius direction, static vane inside diameter side cavity 53 and downstream cavity 31 are formed by box 57 for sealing the static vane inside diameter side cavity 53. Further, ring-like holding ring 38 holding sealing piece 9 for regulating clearance 6 communicating from the upstream cavity 31 to the downstream cavity 32 is provided. <IMAGE>