VENTILATION STRUCTURE FOR TURBINE

摘要

PROBLEM TO BE SOLVED: To provide a gas turbine engine that enables efficient cooling of a member located on the radial inner side of an exhaust diffuser and that has excellent reliability and operation efficiency.SOLUTION: A gas-turbine engine (1) includes: a compressor (3) for compressing air; a combustor (5) for supplying fuel to compressed air (PA) from the compressor (3) for combustion; a turbine (7) driven by combustion gas from the combustor (5); and an annular exhaust diffuser (43) for discharging exhaust gas from the turbine (7). The gas-turbine engine (1) further includes: a ventilation passage (VP) crossing the exhaust diffuser (43) from the radial outer side of the exhaust diffuser (43), passing through a cooling target (57) on the radial inner side and then connected to inside of the exhaust diffuser (43); and an ejector (61) that uses the compressed air (PA) from compressor (3) to supply outside air to the ventilation passage (VP) together with the compressed air (PA) as ventilation air VA (VA).