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Influence of inducer blade parameters on cavitation performance of high flow centrifugal pump

Published:2023-06-25 author:XU Chen-dong, NI Jun-hui, YU Min, et al. Browse: 420 Check PDF documents

Influence of inducer blade parameters on cavitation performance of

high flow centrifugal pump

XU Chen-dong1,2, NI Jun-hui1, YU Min3, SHA Yi2, WANG Zheng-chu1, LU Hao-wen1

(1.School of Aeronautical Engineering, Taizhou University, Taizhou 318000, China; 2.School of

Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Hangzhou

310023, China; 3.Zhejiang Water Pump General Factory Co.,Ltd., Taizhou 317000, China)

Abstract: As one of the important auxiliary parts of centrifugal pump, inducer plays an important role in improving the cavitation performance of pump. Aiming at the problem of poor cavitation performance of a high flow centrifugal pump, the parameters of the inducer of the pump were optimized by means of response surface analysis and numerical simulation. The influence of the lead of inducer, blade thickness and blade number on the cavitation performance of highflow centrifugal pump was investigated.Firstly, the simulation model of large flow centrifugal pump was constructed to calculate the external characteristics, and the reliability of the simulation results was verified by comparing with the experimental results. Then, according to the law of positive correlation between inducer head and pump cavitation performance, taking inducer blade parameters (lead L, thickness T, blade number Z) as variable factors, the maximum inducer head is the optimization target, the response surface of the inducer was calculated and analyzed. The parameters of the inducer blade after response surface optimization were obtained, and the head of the inducer before and after optimization was compared. Finally, the impeller cavitation and critical net positive suction head(NPSH)of the centrifugal pump before and after the optimization of the inducer were compared under different working conditions. The results show that the blade guide has a little influence on the inducer head, but decreasing blade thickness and increasing blade number can improve inducer head. Under rated working conditions, the inducer head is increased by 0.6 m, and the critical NPSH of the pump is reduced by 0.15 m compared with the prototype pump after the response surface optimization, which provides a theoretical reference for the optimal design of the inducer of the high flow centrifugal pump.

Key words: vane pump; blade guide; inducer head; response surface optimization; computational fluid dynamics(CFD); net positive suction head(NPSH)

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