| 摘要 |
A cooling flow passage assembly consisting of pressure side cooling flow passages (50, 54, 56) extending in a span direction and suction side cooling flow passages (51, 52, 55, 57, 58) extending in the span direction and serially connected to the pressure side cooling flow passages is formed in a turbine blade (31). A cooling medium flows through the pressure side cooling flow passages (50, 54, 56) in the direction toward the tip portion and through the suction side cooling flow passages (51, 55, 57) in the direction toward the root. Cooling effect is improved by a Coriolis force. The number of the suction side cooling flow passages is larger than the number of the pressure side cooling flow passages. At least one of the suction side cooling flow passages forms at least one most downstream cooling flow passage (52, 58). The cooling medium flows through the most downstream cooling flow passage (52, 58) and is exhausted outside of the turbine blade through nozzles (48), whereby the flow of the cooling medium through the most downstream cooling flow passage is speeded up. <IMAGE> |
