Abstract
Based on external characteristic test, the performance of designed axial-flow model pump was determined. Combingmixture N-S equations with RNG turbulence model and full cavitation model, the cavitation flow in tip clearance of axial-flow pump at flow rate of best efficiency point is simulated. The results show that the incipient cavitation region is located in the leading edge of tip airfoil. With the decrease of cavitation number, the cavitation region at tip airfoil moves gradually from leading edge to trailing edge. The development process of cavitation can be divided into three different stages and the typical characteristics of each stage are given
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