Effect of slotted blade on cavitation performance of axial flow pump

Abstract

Abstract: In order to investigate the effect of the slotted blade on the cavitation control of the axial flow pump, the 350ZQ-70-H submersible axial flow pump is taken as the research object, and the flow field under different cavitation margins is simulated by steady and unsteady constant values. The velocity vector distribution, pressure distribution, internal void volume fraction and void volume change of the original model and the improved model are compared and analyzed. The results show that the slotted blade can improve the efficiency and head of the axial flow pump, and enhance the performance of the axial flow pump. The slotted blade increases the flow area at the blade inlet, reduces the flow velocity at the blade inlet, improves the pressure distribution in the axial flow pump impeller, and thus suppresses cavitation. In each stage of cavitation, the cavity volume fraction distribution of the slotted model is reduced, especially in the initial stage of cavitation, which is 30.4% lower than the original model, effectively inhibited the development of cavitation and significantly improved the cavitation performance.

Key words: axial flow pump;cavitation, slotted blade, numerical simulat

CLC Number:

TH312

ZHAO Wei-guo, XUE Zi-yang, KANG Yan-dong, CHENG Chao, LI Qing-hua. Effect of slotted blade on cavitation performance of axial flow pump[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 49-55.

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