Effect of Solid Particle Density on Hydraulic Performance of a Prototype Sewage Pump
Abstract— A frozen rotor method based on a mixture multiphase flow model, an RNG k–ε dual-equation turbulence model, and a SIMPLE algorithm is used to perform a numerical simulation of steady flow in a sewage pump that transports solid and liquid phase flows. The method is also utilized to analyze the effect of solid-phase particle density on the hydraulic performance of the sewage pump and predict the wear degree of the overflow components. Results of the study indicate that with the increasing density of solid particles, the head curve of the pump initially decreased and then increased, that is, the head curve had the minimum value. Additionally, the efficiency curve of the pump increased, decreased, and then increased again, indicating an insignificant overall change. Meanwhile, the pump shaft power showed a monotonic upward trend. When the solid-phase density is less than, equal to, and greater than the liquid-phase density, solid-phase concentration on the blade pressure surface shows a distribution law more than, equal to, and less than 10%, respectively. With the increase in density of the delivered solid particles, solid-phase concentration on the blade pressure surface shows a decreasing trend.
Keywords— sewage pump, particle density, frozen rotor method, numerical calculation.
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