| 摘要 |
PROBLEM TO BE SOLVED: To reduce degradation of turbine performance caused by a humid loss and erosion of a moving blade tip positioned in the downstream, by effectively capturing drain generated in stream by a stationary blade to discharge the drain. SOLUTION: This steam turbine is provided with the stationary blade 1 formed inside an enlarged flow passage through which steam passes, an outer ring 3 for fixing a tip of the stationary blade 1, an inner ring 4 for fixing a root end of the stationary blade 1, a moving blade 2 arranged in a down stream of the stationary blade 1, of which the root end is fixed to a rotary shaft, drain discharge grooves 7, 8 formed in a surface of a root part of the stationary blade 1 to be extend along a substantially blade-longitudinal direction of the blade 1, and drain collectors 9, 10 formed inside the inner ring 4 to be communicated with the grooves 7, 8.
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