Abstract

In order to analyze the pressure pulsation characteristics of the two-stage electric lifting pump, three-dimensional, unsteady numerical simulations are conducted by using the SST k-ω turbulence model, SIMPLEC algorithm based on the sliding mesh technique in ANSYS-CFX. The simulated hydraulic performance values agree well with the experimental values, and the accuracy of the numerical model and calculation method is verified. In this article, the pressure values at different positions in the pump flow channel under actual operating conditions (Q=420m3/h) are monitored, and the pressure pulsation characteristics are analyzed in time and frequency domains. Then, the differences of pressure pulsation characteristics between the first and second stage flow channels are compared. The results show that the rotor-stator interaction between the impeller and the diffuser is the cause of the pressure pulsation. The pressure pulsation has a certain periodicity, and the pulsation period is related to the impeller blades and the diffuser blades. The pulsation intensity in the impeller gradually increases from the inlet to the outlet, while the tendency within the diffuser is opposite. The pressure pulsation coefficient amplitude of monitoring points in the second stage flow channel is higher than that of the first stage flow channel. This paper provides a basis for improving the pump structure and further improving the reliability of the electric lifting pump.

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