| 摘要 |
PURPOSE:To improve cooling efficiency by providing cooling air flow passages respectively at the front and rear edge portions within a blade body and narrowing gradually sectional areas for conduction. CONSTITUTION:The front edge portion 13 and the rear edge portion 14 within a blade body are provided respectively with the first and second cooling air flow passages 15, 16. The sectional area for conduction of the portion 22 of the first flow passage 15 is gradually narrowed and connected with an exhaust port 21. Also, the sectional area for conduction of the portion 30 of the second flow passage 16 is gradually narrowed and connected with an exhaust port 29 and orifices 33. As a result, the front edge portion, the middle portion of the back side and the rear edge portion of the blade can be efficiently cooled.
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