转子时序效应对多级离心泵振动特性分析

Analysis of Clocking Effect on Vibration Characteristics of Multistage Centrifugal Pump

泵轴振动特性是影响设备稳定安全运行的重要因素同时也是衡量泵性能的重要指标,本文通过CFD计算流体激振力进行等效动力学特性求解,同时建立了Ansys Workbench转子系统振动模型分析转子时序效应对振动响应的影响。研究表明:各级叶轮所受流体激振力规律相同,其中首级叶轮所受激振力最大;各级叶轮的刚度、阻尼系数呈逐级增加的趋势,末级叶轮相较首级叶轮增大约2倍;时序效应可以显著降低转子系统径向力,主频7APF(414 Hz)、次主频8APF(473 Hz)峰值降低约35%及41%,但对轴向力影响较小,基本忽略轴向振动。

The vibration characteristic of the pump is an important factor affecting the stable and safe operation,and also an important index to measure the performance of the pump.The CFD model of multi-stage centrifugal pump is built,simulation calculation obtains the fluid excitation force were for the equivalent dynamic characteristic solution.Simultaneously,the Ansys Workbench rotor vibration model is established to analyze the influence of the clocking effect on the rotor modal response.The research shows that the laws of fluid exciting force is identical on the impellers,and the largest exciting force at the first-stage impeller;The stiffness and damping coefficients of the impeller tend to increase,and the impeller of the last stage is about 2 times larger than first stage;The clocking effect can significantly reduce the radial force on the rotor system,and the peak amplitude is reduced by about 35%and 41%at first rotor frequency of 7APF(414 Hz)and the secondary rotor frequency of 8APF(473 Hz).