Effects of different structures of blade suction surface on cavitation initiation of centrifugal pump

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (7) : 23-30.

ZHAO Weiguo1,2, KANG Yandong1,2, LI Qinghua1,2, XUE Ziyang1,2

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Abstract

The occurrence of cavitation will affect the stable operation of the centrifugal pump. In order to suppress the occurrence of cavitation, a low specific speed centrifugal pump is used as the research object to carry out a non-constant value simulation. By arranging groove, transverse obstacle and discontinuous obstacle at the leading edge of the suction surface of the centrifugal pump blades, the influence of these three structures on the initial cavitation performance of the centrifugal pump was analyzed. The results show that the arrangement of the three structures has little effect on the head and efficiency of the centrifugal pump. Under the design conditions, after arranging the groove, the head drops by 1.7% and the efficiency increases by 2.4%. After the transverse obstacle and discontinuous obstacle are arranged, the head increases by 2.2% and 1.6%, and the efficiency drops by 2.6% and 2.3% respectively. In the initial stage of cavitation, after the three structures are arranged, it can induce the formation of a relatively high pressure area at the entrance of the impeller, greatly reduce the volume of cavity in the impeller, and inhibit the generation of cavitation. Among them, transverse obstacle has the best effect on suppressing cavitation of the impeller.

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centrifugal pump / unsteady numerical simulation / groove / transverse obstacle / discontinuous obstacle / cavitation suppression

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ZHAO Weiguo1,2, KANG Yandong1,2, LI Qinghua1,2, XUE Ziyang1,2. Effects of different structures of blade suction surface on cavitation initiation of centrifugal pump[J]. Journal of Vibration and Shock, 2022, 41(7): 23-30

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