Numerical Examination of the Dynamic Evolution of Fluctuations in Cavitation and Pressure in a Centrifugal Pump during Startup

Rapid changes in the performance-related parameters of a pump during its startup operation lead to large pressure fluctuations and structural vibrations it. In view these problems, this study investigates evolution cavitation characteristics under centrifugal startup. We use finite volume method simulate dynamic process. To characterize acceleration, we assume that rotational speed rate flow are not constant but vary with time. A steady-state numerical simulation is performed examine external verify accuracy procedure. The cavity over time then analyzed detail. short-term Fourier transform for post-processing light advantage treating non-stationary signals. results indicate both frequency amplitude increase impeller. transient causes average at inlet impeller decrease evaporation pressure, leads an fraction vapor. Moreover, impeller–tongue interaction impeller–diffuser influence cavitation.