In order to further understand the internal flow characteristics of the drainage pump,the hydraulic model of the centrifugal drainage pump is taken as the research object,the Computational Fluid Dynamics(CFD)method is adopted,based on the N-S equation of three-dimensional incompressible fluid and RNG k-ε turbulence model,the internal flow field of the hydraulic model of the centrifugal drainage pump under different working conditions is simulated.The hydraulic performance data obtained through numerical calculation are compared with the test data to verify the reliability of the numerical calculation method.The results show that:when the flow rate is small,there is a flow vortex in the pump,with the increase of the flow rate,the flow vortex phenomenon is improved to certain extent;the radial force of the impeller decreases with the increase of the flow rate,the axial force increases with the increase of the flow rate,and the radial force of the impeller has a large amplitude of periodic variation,while the amplitude of the periodic fluctuation of the axial force of the impeller is relatively small;the main frequency of the pressure pulsation at each monitoring point in the pump is one time of the blade frequency,the high amplitude pressure pulsation is concentrated in the low frequency area,and the amplitude of the main frequency pulsation decreases with the increase of the flow rate.The research results prove the internal flow characteristics of the drainage pump,which can provide useful reference for the optimization design of similar pumps,and thus improve their operating efficiency.
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