| 摘要 |
A turbine blade exposed to a hot atmosphere with a relatively high temper ature and to a cold atmosphere with a relatively low temperature. The turbin e blade has a concave pressure surface concaved along the direction in which a fluid flows, a convex negative pressure surface convexed along the direct ion in which the fluid flows, and depression/projection forming means for ca using, when it is exposed to the cold temperature atmosphere, a depression/p rojection part present along the flow of the fluid to appear in the negative pressure surface and causing, when it is exposed to the hot temperature atm osphere, the negative pressure surface to be a smooth surface present along the convex surface. With this constitution, the pressure loss of the turbine blade at a low Reynolds number in the cold temperature atmosphere can be re duced without increasing the pressure loss of the turbine blade at a high Re ynolds number in the hot temperature atmosphere.
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