Experimental Study of the Pressure Fluctuations in a Pump Turbine at Large Partial Flow Conditions

查看全文 作　　者：RAN [1,2]Hongjuan;LUO [1]Xianwu;ZHU [1]Lei;ZHANG [1]Yao;WANG [1]Xin;XU [1]Hongyuan

机构地区：[1]State Key Laboratory of Hydroscience & Engineering, Tsinghua University, Beijing 100084, China;[2]Laboratory of Hydraulic Machine, Swiss Federal Institute of Technology Zurich, Lausanne, Switzerland

出　　处：《Chinese Journal of Mechanical Engineering》索引2012年第25卷第6期,共5页

基　　金：supported by National Natural Science Foundation of China(Grant No. 50976061);State Key Laboratory of Hydroscience and Engineering of China(Grant No. 2010-ZY-4);Beijing Municipal Natural Science Foundation of China(Grant No. 3072008) 摘　　要：Frequent shifts of output and operating mode require a pump turbine with excellent stability. Current researches show that large partial flow conditions in pump mode experience positive-slope phenomena with a large head drop. The pressure fluctuation at the positive slope is crucial to the pump turbine unit safety. The operating instabilities at large partial flow conditions for a pump turbine are analyzed. The hydraulic performance of a model pump turbine is tested with the pressure fluctuations measured at unstable operating points near a positive slope in the performance curve. The hydraulic performance tests show that there are two separated positive-slope regions for the pump turbine, with the flow discharge for the first positive slope from 0.85 to 0.91 times that at the maximum efficiency point. The amplitudes of the pressure fluctuations at these unstable large partial flow conditions near the first positive slope are much larger than those at stable operating condtions. A dominant frequency is measured at 0.2 times the impeller rotational frequency in the flow passage near the impeller exit, which is believed to be induced by the rotating stall in the flow passage of the wicket gates. The test results also show hysteresis with pressure fluctuations when the pump turbine is operated near the first positive slope. The hysteresis creates different pressure fluctuations for those operation points even though their flow rates and heads are similar respectively. The pressure fluctuation characteristics at large partial flow conditions obtained by the present study will be helpful for the safe operation of pumped storage units. 关键词：水泵水轮机压力波动流动条件汽轮机不稳定性实验抽水蓄能机组性能试验

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Experimental Study of the Pressure Fluctuations in a Pump Turbine at Large Partial Flow Conditions

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