Study on particle passing capacity and flow loss characteristics in sewage pump
In order to study the influence of columnar particle parameters on the characteristics of solid-liquid two-phase flow and the passing capacity in sewage pump,CFD-DEM coupling method was used to calculate the solid-liquid two-phase flow in centrifugal pump,the flow energy loss characteristics of the pump under different particle properties conditions were analyzed based on the entropy production theory,and numerical simulation was verified by experiment.The results show that the length-diameter ratio,volume fraction and density of columnar particle have impacts on the passing capacity and flow energy loss of the particles in the sewage pump.As the solid phase concentration increases from 1%to 5%,the pump head decreases by 1.97 m,the efficiency decreases by 2.2%,and the particle passing capacity gradually decreases.As the particle density increases from 1000 kg/m3 to 2500 kg/m3,the pump head decreases by 1.63 m,the efficiency decreases by 3.76%,and the particle passing capacity is slightly enhanced.Under each working condition,the change law of total entropy production is consistent with that of pump performance,and the high entropy production area is mainly concentrated near the inlet edge of the blade,which indicates that entropy production analysis can effectively reflect the flow loss characteristics in the pump.The research results can provide theoretical basis for the optimal design of sewage pump.
sewage pumpcolumnar particleCFD-DEMpassing capacityentropy production
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