| 摘要 |
PURPOSE:To restrain erosion of a nozzle blade by making the height of a fluid path portion at the exit end of the nozzle blade smaller than the height of a fluid path portion at the exit end of a nozzle box. CONSTITUTION:The exit end 13a of a nozzle blade 13 is formed upstream from the exit end 11a of a nozzle box 11, and the height Ha of a fluid path portion at the exit end 13a of the nozzle blade is made smaller than the height Hb of a fluid path portion at the exit end 11a of the nozzle box. Thus, an outflow angle at the nozzle blade 13 is increased and a collision angle of solid particles which are included in an operation fluid is decreased, thereby erosion of the nozzle blade 13 can be restrained. |
