| 摘要 |
PROBLEM TO BE SOLVED: To improve the cooling effect of a platform by improving strength by reducing the stress of a rear edge hub part, tip tinning, and a fillet R, concerning a gas turbine moving blade. SOLUTION: A serpentine passage, composed of a cooling passage 5a in a front edge part, cooling passages 6a, 6b and 6c in which cooling air flows from the center to the front edge side, and cooling passages 7a, 7b and 7c in which cooling air flows to the rear edge side is formed on a single stage moving blade 1 to cool a blade. Fillets R4a, 4b' on the front and rear edge sides are made larger than conventional fillets or the other fillets R for improving the strength of both ends, and recessed parts 3a, 3b are provided on the front and rear edge sides of a platform 2. In the platform 2, cooling passages are provided on both sides on the back side and the front side to allow cooling air to flow from the front edge to the rear edge side, and many cooling holes are provided on the side surface on the back side to allow air to flow from the cooling passages. The fillet R is made large, the strength is improved by the recessed parts 4a, 4b, and the cooling effect of the platform is improved. |
