Vibration analysis of large centrifugal pump rotors

Through the critical speed of centrifugal pumps, internal flow and the force of the impeller, we analyze centrifugal pump vibration. Using finite element analysis software ANSYS to calculate the nature frequency of the rotor system and the critical speed; with the help of the Fluent software to simulate pump internal flow field, we conclude that speed increase will not cause intense vibration of the fluid in the pump. Using unsteady numerical simulation we discovered that in and impeller suffering transient radial force cyclical change periodically, as well as the frequency size determined by the product of the impeller speed and number of blades, resonance phenomena should make impeller to transient radial force frequency. If wanting to avoid pump resonance when it is running away, the transient radial force frequency should avoid the frequency range which can cause resonance.