Prediction of Pressure Fluctuation of a Pump-Turbine at No-Load Opening
Prediction of Pressure Fluctuation of a Pump-Turbine at No-Load Opening
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发表时间：
2012
影响因子：
2.4
通讯作者：
L. Jin
中科院分区：
文献类型：
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作者：
L. Jin
为了研究导叶错位水泵水轮机空载开度时的压力脉动特性，提高同步成功率，采用RNG k-1对带MGV装置的水泵水轮机在空载工况下进行了研究，计算结果表明，转轮与导叶之间的压力脉动较大，在一定范围内，压力脉动的大小与转轮内的压力脉动的大小成正比，而转轮与导叶之间的压力脉动的大小与转轮内的压力脉动的大小成正比由叶片通过频率决定，尾水管内涡绳周期性旋转，使压力脉动频率较低，转轮与预开导叶之间区域压力脉动幅度最大。
In order to study characteristics of pressure fluctuation of pump-turbines with misaligned guide vanes(MGV) at no-load opening and improve the probability of successful synchronization,a pump-turbine with MGV device at no-load condition was investigated using RNG k—eturbulence model.The inner flow distribution and pressure fluctuation characteristics were analyzed.Results show that the pressure fluctuation in the region between the runner and guide vanes is determined by the blade passing frequency.Vortex rope in the draft tube rotates periodically,making the pressure fluctuate with a low frequency.The region between the runner and pre-opening guide vanes has the maximum amplitude of pressure fluctuation.