Abstract：At the designed operating conditions of the counter-rotating axial-flow pump, the cavitation flow field were simulated using cavitation model, Rayleigh-Plesset equations and the SST turbulence model, for 3 configurations: the pump with front impeller only, the pump with rear impeller only, and the pump with both impellers.The H-NPSH curves of the three cases were established based on the simulation. The cavitation flow of front impeller and rear impeller were analyzed by comparing the primary cavitation, critical cavitation, and serious cavitation.The distribution of static pressure and vapor volume fraction of the blade's suction surface and pressure surface were observed and the vapor volume fraction of the suction surface was obtained. The results show that cavitation first occurred on the local low-pressure area on the back of the blade′s leading edge,then extended to hub from leading edge while decreasing NPSH. The cavitation development of the front impeller and rear impeller are not synchronous. The results reveal that the cavitation flow in counter-rotating axial-flow pump and its excellent cavitation performance.
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