| 摘要 |
PURPOSE:To smoothly guide a working fluid for thereby ensuring a stable rotation of turbine blade, by providing a curve of specific configuration to the inner peripheral wall surface of moving blade nozzle placed at the turbine stage immediately downstream of confluence of primary and secondary working fluids suplied from respective supply pipes. CONSTITUTION:A turbine rotor 21 is freely turnably provided inside a turbine casing 20, having a plurality of rotor wheels 22 ingrally provided therewith. Turbine blades 23-26 are embedded in the wheels 22. Pairs of stator blades 27-30 are provided at the upstream of respective blades 23-26 which are in turn secured on the inner peripheral wall of turbine casing 20 for forming a turbine passage. In this case, a curved configuration is provided to the inner peripheral wall surface 29a of nozzle situated at the inner radial side of moving blade 29 of medium stage where primary and secondary working fluids G1 and G2 confluent. That is, the inner peripheral wall surface 29a of nozzle is formed with such a smooth curved surface as it goes away from the turbine rotor 21 progressively in the downstream direction. |
