Abstract：In order to research the mechanism of pressure fluctuation that were caused by the impeller-volute interaction of a high-speed partial emission pump,a numerical simulation of unsteady flow was carried out by applying the sliding mesh technique in computational fluid dynamics software Fluent on the whole pump under three working points of 0.5Q0,1.0Q0 and 1.5Q0,respectively.The static pressure distribution of volute was recorded at three different times and flow rates,and the time and frequency domain of pressure fluctuation of 9 monitoring points in the inner wall of volute were analyzed by fast Fourier transform for velocity and pressure.The simulation results show that static pressure has not much change over time at the same flow rate.At the same time,the static pressure increases with flow rate.The pressure fluctuation has a cyclic variation,and the amplitude value decreases with increasing of the flow rate.The amplitude value of monitoring point 4 is biggest at the small flow rate condition,but the amplitude value of monitoring point 5 is biggest at the design and large flow rate conditions.The frequency amplitude value increases with increasing of the flow rate.It illustrates that the flow rate has a great impact on vibration of high-speed partial emission pump,and this phenomenon is particularly serious in the nozzle region.
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