Analysis of Transient Cavitation Flow and Pressure Pulsation of Guide Vane Centrifugal Pump
WANG Hao1,LI Lin-wei2,MOU Cheng-qi3,ZHOU Pei-jian1,WU Deng-hao1
1. School of Metrology and Testing Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. Huadian Electric Power Research Institute Co., Ltd., Hangzhou, Zhejiang 310030, China
3. Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China
Abstract：The RNG k-ε turbulence model and the Zwart-Gerber-Belamri cavitation model are used to numerically simulate a guide vane centrifugal pump, and the internal pressure pulsation spectrum curve is obtained. The results show that the pressure pulsation peak-to-peak value of the impeller monitoring point gradually decreases along the flow direction, and the main frequency is 8 times the rotation frequency and its multiplication frequency. With the intensification of cavitation, the peak-to-peak value of impeller pressure pulsation gradually decreases. The main frequencies of the pressure pulsation of the forward and reverse guide vanes are both the vane frequency and its multiplier, and the amplitude increases with the development of cavitation. The cavitation in the axial direction shows that the cavitation volume fraction gradually increases from the front cover plate to the rear cover plate of the impeller. The dynamic and static interference between the impeller and the positive guide vane causes periodic changes of the flow field in the impeller, resulting in periodic fluctuations in the pressure pulsation.
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2023, Vol. 44 
