Abstract
The unsteady cavitation flows in a centrifugal pump are numerically simulated by using the RNG k-ε turbulence model and the improved mass transport cavitation model. The calculated data is in good agreement with the experimental results, so the numerical modal and method can accurately predict the cavitation flows in a centrifugal pump. The flow characteristics without and with cavitation are analyzed by setting 15 monitoring points in the impeller. The calculation results indicated that the dominant frequencies of pressure fluctuations in impeller is the impeller rotating frequency fi and 2fi, the impeller rotating frequency always played the dominant role. Under non-cavitation condition, the maximum value of pressure fluctuation amplitudes appears at impeller outlet. Under cavitation condition, the maximum value of pressure fluctuation amplitudes appears near 4/5 blade length from blade inlet. The shedding and collapsing of cavitation bubbles in impeller, which disturbs the flow field of pump impeller and causes the amplitude of pressure fluctuations increase. This research provided a reference for optimization design of impeller in centrifugal pump.
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