| 摘要 |
To improve removal efficiency of a water film formed on a pressure surface of a stator blade by means of a simple processing of the stator blade, thereby to suppress erosion of a rotor blade, a hollow portion 12a is formed inside a stator blade 12, and a slit 22 which has an inlet opening a on a pressure surface fs of the stator blade facing wet steam flow s and which is in communication with the hollow portion 12a in the axial direction of the stator blade. The hollow portion 12a is communicated with a region having a lower pressure than the flow field of the wet steam flow s. The pressure in the hollow portion 12a is reduced to introduce water film flow sw formed from water drops dw on the pressure surface fs of the stator blade to the slit 22. The slit 22 is formed at an downstream side end, in the flow direction of the wet steam flow s, of the hollow portion 12a, and the stator blade trailing edge side wall surface 22a of the slit 22 is provided so as to be at an acute angle to a leading edge side reference plane of the pressure side fs of the stator blade. Accordingly the inlet opening a can be disposed closer to the trailing edge re side of the stator blade. |
