转子时序效应对多级离心泵振动特性分析OA北大核心CSTPCD

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).