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Effects of blade angle at high pressure end on performance of pump-turbine with high head |
Ruan Hui, Liao Weili, Zhao Yaping, Luo Xingqi |
Institute of Water Resources and Hydro-Electric Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China |
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Abstract Based on a design procedure for low specific speed Francis runners, three kinds of blades with different blade angles at high pressure end are generated while the rest parameter remain unchanged. The steady, three-dimensional turbulent flows in the pump-turbines with those blades are simulated by means of CFD method at five flow rates to identify the effects of the blade angle on the performance in pump and turbine modes and the inflow condition in the turbine mode as well as the rotor-stator interaction in the pump mode. It is proven that the predicted angle of attack is different from the angle prescribed in the design and the runner is subject to a negative angle of attack in the turbine mode, which results in a remarked shock loss and a slight efficiency reduction but the flow in the runner seems little affected. In the pump mode, the larger the blade angle is, the smaller the rotational angle of the guide vanes is. The hydraulic efficiency is the highest in that mode with blade angle 2, which matches the 14? rotational angle of the guide vane and the stay vane. However, the other two kinds of blade angles mismatch the guide vane and the stay vane, causing instable phenomena, such as shock, reverse flow and flow separation and so on, and leading to a serious declination in the hydraulic efficiency.
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Received: 25 July 2014
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