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中文摘要：
为了分析双叶片螺旋离心泵内部流动压力脉动特性,以ZJ200-25型螺旋离心泵为研究对象,采用Navier-Stokes方程和标准SST k-ε湍流模型对其内部流场进行了多工况全流道非定常数值模拟。在叶轮与蜗壳耦合面上以及泵进出口处设置了7个监测点,计算得出了各监测点的压力脉动时域及频谱特性。计算结果表明,各工况下螺旋离心泵内压力波动呈明显的周期性变化规律;轴频和叶频是流道内压力脉动的主频：叶轮与蜗壳耦合处以及隔舌处的压力脉动主频基本为轴频,进、出口压力波动主频接近叶频;进口脉动幅值相对出口及泵内脉动幅值很小,高频成分也相对减少;同一监测点在不同流量下主频相同,但主频振幅各不相同,设计流量下的主频振幅最小,小流量下的主频振幅最大;叶轮与蜗壳耦合面上的监测点,在距离隔舌越远处,其压力脉动强度越低。
英文摘要：
In order to analyze the inner flow pressure fluctuation performance in screw type centrifugal pumps,a ZJ200-25 screw type centrifugal pump with double screw blades was chosen as the study subject.Based on Navier-Stokes equations and shear stress transport（SST） turbulent models,3-D unsteady flow field of the pump was simulated numerically under several operating conditions.Seven monitor points were set at the impeller-volute coupling interface,inlet and outlet faces of the pump.The pressure fluctuation and the corresponding frequency spectrum at different monitor points were obtained from the simulation.The simulation results showed that the pressure fluctuation in the pump was periodical at different operating flow rates.The impeller blade passing frequency and impeller rotational frequency were the dominant frequency at different positions,where the dominant frequency of the impeller-volute coupling interface was nearly equal to the impeller rotational frequency,and that at the inlet and outlet face were nearly equal to the impeller blade passing frequency.The amplitudes of the pressure fluctuation at the inlet and outlet were lower than that of the impeller-volute coupling interface,and the high-frequency components at the inlet and outlet were fewer than that of the impeller-volute coupling interface.The dominant frequency at the same monitor point was constant but with different amplitude at different operating conditions,the pressure fluctuation at the coupling interface had a lower strength at the position where far away from the volute tongue.
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