| 摘要 |
PURPOSE:To improve cooling efficiency while using Coriolis force by ejecting cooling medium from the cooling passage of the lowermost downstream through a film cooling hole as well as to run a back side cooling passage to the inner direction of a radical direction and run the cooling passage of the lower, most downstream of the back side cooling passage to the outer direction of the radial direction in a turbine cooled blade. CONSTITUTION:A plurality of passages for a cooling medium are formed in such a way that barrrier walls 35 are partitioned by back/web separation walls 36 in a hollow blade. The cooling medium is run to the inner direction of a radial direction by a back side cooling passage 57, and ejected from the back side cooling passage 58 of the lowermost downstream through a film cooling hole 48 while running it to the outer direction of the radial direction by the back side cooling passage 58. By this process, cooling efficiency is further improved while using Coriolis force. Further, the cooling passages may be provided with a web side cooling passage and the back side cooling passage which are partitioned by walls approximately parallel or approximately perpendicular against a blade rotation direction, and convection cooling effect can be increased by ejecting many vertical eddies in the cooling medium flow so as to make its inside in a turbulent flow condition. |
