The paper determines the structure of the compound hydrocyclone, by using RNG k model for calculation of flow distributor. By utilizing Reynolds Stress Model (RSM) and Discrete Phase Model (DPM), the internal flow fields of the hydrocyclone with different tangents of inlet channels are analyzed and the separation efficiency of the hydrocyclone is calculated. Determining the structure of flow distributor; getting the optimal angle between beveling hydrocyclone with single inlet channel and external surface of ring pipes of distributor; the best beveling angle of inlet channel of beveling hydrocyclone with single inlet channel is 5°. KEYWORD: flow distributor; Reynolds Stress Model; compound hydrocyclone; Reynolds Stress Model; separation efficiency INTRODUCTIONAt present, the hydrocyclone has been widely used in many fields, such as paper, coal, mineral processing, food, petroleum, chemical industry and so on. In the basic flow of urban sewage processing, sewage contains 1.2% to 2% of solid sludge before sludge dewatering. If the sewage is further concentrated before dewatering, working efficiency of filter press or centrifuge in sludge dewatering is obviously improved and the cost of sewage processing is greatly reduced.Experts and scholars have done lots of research on the effects of different geometric parameters and operating parameters to the performance of hydrocyclone .The influence of the pressure field and velocity field of hydrocyclone was studied by Jiang Minghu et al
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