Performance prediction of multistage doublesuction centrifugal pump based on numerical simulation
(1.College of Hydraulic Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024,China; 2. Shanxi Yuncheng Beizhao Yellow River Diversion Project Construction Management Bureau, Yuncheng, Shanxi 044000,China)
Based on the Reynolds timeaveraged N-S equations, the SST k-ω turbulence model and the SIMPLEC algorithm, the 3D steady turbulent flow within a multistage doublesuction centrifugal pump, which was installed in Xiecun Pump Station of Beizhao Yellow River Diversion Project, was simulated.The velocity vector field and other information at different operation conditions were obtained, the pump performance was predicted and was compared with the field test data. The results show that the flow fields are uniform in both the suction chamber of the firststage and the volute of the secondstage.Because of the complicated structure of crossover and fluid itself inertia, a vortex region is found in the abrupt expansion region of the crossover, and the size of the vortex region is related to flow rate. The predicted head is consistent with the field test data, and the maximum error between them is 2.7%. The hydraulic efficiency curve estimated against capacity resembles to the pump efficiency curve measured in the pump station as well.The simulation of flow within a pump can provide a reference for performance prediction and structure optimization during the pump design process in an engineering project.
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