轴流泵内部压力脉动特性及流动诱导噪声研究

Research on Pressure Pulsation Characteristics and Flow Induced Noise in Axial-flow Pump

为了研究转速对轴流泵内部压力脉动特性及流动诱导噪声的影响,通过对轴流泵进行非定常数值计算,获取了3组转速下轴流泵内部不同监测点处的压力脉动特性。对叶片旋转偶极子源作用的噪声场进一步进行数值模拟,分析了转速对轴流泵流动诱导噪声的影响。结果表明:3组转速下的不同压力脉动监测点处,其主频及次频基本保持一致;随着转速的降低,压力脉动幅值也逐渐减小,辐射声场的声压级也逐渐减小,研究轴流泵内部压力脉动特性对于流动诱导噪声的控制具有指导作用。

In order to study the effect of rotational speed on the pressure fluctuation characteristics and flow-induced noise in an axial flow pump,the pressure fluctuation characteristics at different monitoring points in an axial flow pump under three sets of rotational speeds are obtained by calculating the unsteady values of the axial flow pump.The noise field caused by rotating dipole source of blade is further simulated,and the effect of rotating speed on flow induced noise of axial flow pump is analyzed.The results show that the main and secondary frequencies of pressure fluctuation monitoring points are basically the same at three groups of rotating speeds.With the decrease in rotating speed,the amplitude of pressure fluctuation decreases gradually,and the sound pressure level of radiated sound field decreases gradually.The study of pressure fluctuation characteristics inside the axial flow pump has a guiding role in the control of flow-induced noise.