Optimization design of multistage centrifugal pump impeller by orthogonal experiment and CFD
WANG Wei1, SHI Weidong1, JIANG Xiaoping1, FENG Qi1, LU Weigang1, ZHANG Desheng1,2
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China
In order to improve the hydrodynamic performance of a typical cantilevered multistage centrifugal pump, orthogonal experiment and numerical simulation are carried out when four main impeller geometric parameters including blade outlet width, impeller diameter, number of blades and exit blade angle are changed. A computational fluid dynamics(CFD)code is employed to simulate the three-dimensional steady turbulent flows in the pumps with the designed impellers and the same diffuser. It is shown that the predicted pump performance curves present good agreement with the experimental ones for the original pump model, indicating the numerical prediction of performance is correct and reliable. According to the L9(34)experimental design table., nine impellers are designed and the head and efficiency of the pumps with these impellers are obtained at the duty point. Simultaneously, the effect of geometric parameters on the pump performance is concluded through variance analysis, eventually an optimal set of parameters are resulted. Afterwards, by a comparison of head and efficiency between the optimized and the original models, it is illustrated that there is a significant improvement in performance in the optimized model. It is the absence of swirling and reverse flows and less hydraulic losses as well as the large pressure gradient that are responsible for the performance improvement.
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