| 摘要 |
PURPOSE:To prevent the generation of vibration, noise and cavitation with a considerably low flow rate by installing the runner vanes having high and low specific speed at the both edges of a vane wheel, having the flow-water branched part as boundary. CONSTITUTION:A runner vane 5a having a high specific speed and a runner vane 5b having a low specific speed are arranged onto the both sides of the flow-water branched part 6 of a vane wheel 5. In such constitution, in close to the max. flow rate of a water wheel, water flows in the runner vanes 5a and 5b at the same time, and output is controlled by the equal opening-degree adjustment due to the simultaneous flow in the guide vanes 3a and 3b. At the medium flow rate, a flow passage 3b is closed by turning the guide vane 3b, and a flow passage 4a is allowed to communicate to the runner vane 5a having a high specific speed, and the output is controlled by adjusting the opening degree by the turn of the guide vane 3a. In low flow rate, the flow passage 4a is closed by turning the guide vane 3a, and the flow passage 4b is allowed to communicate to the runner vane 5b, and the output is controlled by adjusting the opening degree of the guide vane 3b.
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