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随着水力机械单机容量和尺寸的增加 ,人们对其运行稳定性和振动问题日益重视 ,这就使水力机械内部不稳定流场计算显得十分必要。该文以水泵水轮机为对象 ,应用先进的“滑移网格技术”,采用 PISO(pressure- implicit withsplitting of operators)方法计算了包含涡壳、固定导叶、活动导叶及叶轮在内的过流通道内由于动静干涉 (rotor- statorinteraction,RSI)现象引起的不稳定流场 ;对计算结果进行FFT (fast Fourier transform )变换 ,获得了记录点的压力脉动频率 ,计算结果与实测结果吻合很好 ;两结果都表明压力脉动频率与转轮叶片通过频率密切相关
With the increase of single capacity and size of hydraulic machinery, people pay more and more attention to its running stability and vibration problems, which makes it very necessary to calculate the unsteady flow field in hydraulic machinery. This paper takes the pump turbine as an example and applies the advanced “slip-grid technology” to calculate the over-current flow including the volute shell, the fixed guide vane, the movable guide vane and the impeller by means of PISO (pressure-implicit withsplitting of operators) The unstable flow field caused by the phenomenon of rotor-stator interaction (RSI) in the road is analyzed. The fast Fourier transform (FFT) is used to calculate the pressure pulsation frequency of the recorded points. The calculated results are in good agreement with the measured results. Two The results show that the pressure pulsation frequency is closely related to the runner blade passing frequency