MOISTURE SCATTERING PREVENTION STRUCTURE OF STEAM TURBINE

PROBLEM TO BE SOLVED: To reliably discharge a film of water flowing along the blade surface of a stator blade toward the outside of a steam passage, by disposing a plurality of slits on the blade surface of a stator blade of a steam turbine, which are inclined in the direction of the blade length from the rear edge of the stator blade toward the front edge thereof. SOLUTION: A stator blade 3 has a plurality of moisture induction slits 9 which are inclined in the direction of the blade length from a rear edge 8 of the stator blade 3 toward the front edge thereof and extended onto an inner wall 10 of an outer ring 2. The moisture induction slits 9 are formed on the front and back surfaces of the stator blade 3. With this configuration, before a film of water adhering onto the blade surface of the stator blade 3 and flowing down reaches the rear edge 8 and scatters, it is possible to induce the film of water to the inner wall 10 on the front-end side of the blade. Further, since a plurality of moisture induction slits 9 are formed, it is possible to capture drain spilling from a first slit with the next slit and guide the drain to the inner wall 10. After reaching the inner wall 10, the drain 11 flows down to a perimeter-direction slit 7 due to the flow of steam, is discharged to an annular groove 12 which is outside a turbine passage, and is then discharged from a hole 13 to a low-pressure side, for example, to a steam condenser.