Abstract：Semi-open vortex pump has one new kind of semi-open impeller. In order to study the cavitation performance, a numerical simulation was conducted to analyze internal flow field of semi-open vortex pump. One-phase model based on Reynolds time-averaged equations and RNG k-ε turbulence model was used. The distributions of pressure and velocity on blade surface were obtained. The bottom of semi-open impeller is crucial area for cavitation. Based on summarizing the detection of cavitation, the method combined sound and flow-head way was adopted for cavitation experiment. The results show that the semi-open vortex pump performance is steady and the semi-open impeller improve the cavitation performance. Under the same conditions, semi-open vortex pump performance is better than that of closed one. This provides basis of theoretical research and design for semi-open vortex pump.
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