Abstract In order to research influence of inlet shape on centrifugal pump vibration and noise, ensuring the pump and impeller′s other geometric parameters constant, only changing the form of the centrifugal pump inlet, the vibration induced by inlet was studied from two aspects, test and numerical simulatione velocity and the unsteady state pressure characteristics of the two forms of centrifugal pump before and after improvement were obtained, analyzed comparatively and verified experimentally, measuring the vibration signals of model pump feet under different forms of inlet, and processing the vibration signal data to verify the simulation conclusion and the vibration generated by modifying centrifugal pump inlet. The results showed that: the changed centrifugal pump inlet has a certain improvement effect on pressure and velocity distribution within the inlet and impeller, straight centrifugal pump had smaller influence than the pre-impact spin one on flow field, all the observation points′ pressure fluctuations of impeller and volute were reduced and the seat vibration response was reduced by 5 dB under experimental verification.
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