| 摘要 |
PURPOSE: To improve hydraulic turbine part load efficiency by extending a region near a runner band of an impeller vane outlet end in the hydraulic turbine flowing direction toward the downstream direction of a flow of a hydraulic turbine, gradually extending this extended part as it approaches the runner band and reducing only an angle of a hydraulic turbine impeller vane near the runner band. CONSTITUTION: A region near a, runner band 7 of a hydraulic turbine impeller vane outlet end 8 of a runner vane 4 is extended toward the downstream side in the hydraulic turbine flowing direction so as to make a curved outline. Additionally, when an angle from the circumferential direction of a curved line To made by connecting a vane thickness center of a vane head end part at a point G where the hydraulic turbine impeller vane outlet end 8 starts extending toward an outlet in the hydraulic turbine direction is set as a vane outlet angleβo, the vane outlet angleβo of the extended vane head end part is reduced as it approaches the runner band 7. Additionally, extension quantity of the hydraulic turbine impeller vane outlet end 8 of the runner vane 4 is increased as it approaches the runner band 7.
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