| 摘要 |
PROBLEM TO BE SOLVED: To increase the output while restricting the pressure loss by supporting both ends of a stator blade with the outer peripheral wall and the inner peripheral wall, and forming at least one of the outer peripheral wall and the inner peripheral wall with a recessed compensation flow passage corresponding to the opposite cross-sectional area of the stator blade so as to compensate the flow passage area reduced by the opposite cross sectional area of the stator blade. SOLUTION: A steam turbine is formed with flow passages 8, 8 by arranging turbine nozzles 7, 7 in a ring along the circumferential direction of a turbine shaft, and converts the energy of the steam ST flowing in the flow passages 8, 8 to the velocity energy. In order to compensate for the area of the flow passages 8, 8 reduced by the opposite cross-sectional area NAX of the turbine nozzles 7, 7 recessed compensating flow passages 11, 11 having a compensation part NLAX corresponding to the opposite cross sectional area NAX is formed in at least one of an outer wheel 9 and an inner wheel 10 of a diaphragm. With this structure, a larger quantity of the operating fluid can be made to flow, and the pressure loss is reduced so as to enable the operation with high blade efficiency.
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