In order to study impact of blade number on fluid-induced vibration in centrifugal pumps, the impellers of a centrifugal pump were designed with 6 and 7 blades while the rest geometry remains unchanged, the fluid induced vibration in the pump was investigated by experiment and simulation si-multaneously. Firstly, the RNG k-ε turbulence model was used to simulate the steady and unsteady flow in the two configurations; secondly, the steady velocity and pressure, and unsteady pressure fluctuations were obtained and analyzed. Finally, the vibration signals at pump feet were measured and processed to validate the simulated results and the effect of blade number. The results showed that the pressure pulsation at monitoring points in the impeller and volute with 6 blades was less than that with 7 blades, and the vibration response at the feet under shaft rotational frequency was also smaller. For the impeller with 7 blades, the peak value at two times the shaft rotational frequency and the blade passing frequency became larger; while the amplitude at the frequency larger than the blade passing frequency was decreased. These results can be instructive for design of a centrifugal pump with low vibration and noise.
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