Characteristics of  unsteady cavitational  flow  in centrifugal pump with low specific speed

Abstract

Abstract: In order to study the characteristics of cavitational flow within centrifugal pump with low specific speed, the numerical simulation of three-dimensional unsteady cavitational flow in the pump was carried out on the basis of SST k-ω turbulence mode and ZGB cavitation mode and under different inlet pressure, and the regularity of pressure pulsation and the change of bubble volume as well at different positions in the pump were investigated when cavitation occurred. The result showed that the principal frequency of the impeller pressure pulsation would be the blade frequency, and the growth of amplitude of secondary frequency fluctuation at the inlet of impeller channel would be obvious. The growth rate of the amplitude pressure pulsation near the outlet of impeller channel would increase even more obviously when compared with that at the inlet of impeller channel. Also when cavitation took place, the pressure fluctuation at the inlet of the impeller channel would be delayed from that within the impeller, at its outlet and at its separate tongue. The growth of cavitational vapor bubble would be nonlinear.

Key words: centrifugal pump, unsteady flow, cavitation, pressure fluctuation

CLC Number:

TH311

ZHAO Wei-guo, WANG Gui-peng, ZHAO Guo-shou, XIA Tian. Characteristics of unsteady cavitational flow in centrifugal pump with low specific speed[J]. Journal of Lanzhou University of Technology, 2020, 46(3): 50-56.

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Characteristics of unsteady cavitational flow in centrifugal pump with low specific speed

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