Abstract:The cavitation performance and cavitating flow field for a multi-stage vertical barrel pump was investigated by experiment and numerical calculation. The effects for several geometrical parameters of impellers on cavitation were analyzed so as to improve the cavitation performance of the pump. Through the present study, the following conclusions can be drawn: by applying a first stage impeller with double suction and large passage section area at impeller inlet, and an inducer at each suction side of the impeller, the cavitation performance was improved considerably. The cavitation specific speed for the pump was 1 479; the cavitation model based on the homogeneous mixture assumption reasonably predicted the average cavitation performance for the pump. The simulated cavitating flow field is helpful for understanding the effect of the hydraulic design factors on cavitation development inside the pump; choosing large blade inlet angles for the inducer and the first stage impeller was beneficial for improving the cavitation performance as well as making full use of the inducer.
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