| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbine airfoil including a high efficiency cooling hole at a leading edge. SOLUTION: This turbine airfoil 32 includes the leading edge 36 and a trailing edge 38 arranged at an interval in the axial direction, and the leading edge 36 has an external surface curvature extending in the axial direction. A cooling circuit 50 in the airfoil includes the cooling hole 60 formed in the leading edge 36 along the span axis of the airfoil. The cooling hole 60 has a diffuser section communicating with a surface of the leading edge 36. The diffuser section has four opposed walls forming an outlet opening part having a substantially linear rectangular shape on the surface of the leading edge 36. One of diffuser walls has a convex curvature close to the external surface curvature of the leading edge 36 so that flow of fluid from an outlet of the cooling hole is uniformly scattered and sprayed along a land part of the leading edge 36 adjacent the cooling hole 60. COPYRIGHT: (C)2006,JPO&NCIPI
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