| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in which a centrifugal force attributable to rotation of a rotor acts on water droplet or a water film produced from working steam to guide it to outside a moving blade, and the guided water droplet or water film scatters and collides at a high speed against nearby a moving blade tip which has fast circumferential speed because of a large diameter, and consequently causes erosion of the moving blade tip.SOLUTION: A guide groove or guide rib for guiding a water droplet or water film produced from working steam is provided, so that the water droplet or water film is prevented from being guided to a moving blade tip side, and consequently the water droplet or water film is prevented from colliding at a high speed against nearby the moving blade tip which has fast circumferential speed, thereby reducing erosion of the moving blade tip.SELECTED DRAWING: Figure 2 |
