In order to evaluate the influence of ultrasonic cavitation on mixing, based on the method of UFD (User Defined Function), the flow field in the mixer（KSM）was numerical simulated by using FLUENT software and verified by experiment. The results showed that the fluid in the KSM mixed faster and more uniform due to the ultrasonic cavitation. The pressure drop of the mixer increased slightly. The flow rate of the fluid increased from 0.50 m/s to 0.55 m/s at the inlet of the mixer and it increased by 10%. The turbulence intensity of the fluid was enhanced, and the strengthening effect was most significant at the first mixing element. And more important, the strengthening effect was most significant for the first element which is basically stable after second mixing elements. The result of experiment also is basically consistent with the simulation results. The fluid mixed more uniform and the mixing was better. With the addition of ultrasonic cavitation, the mixing of the fluid in the static mixer was more uniform and the mixing effect was better.

The impeller and volute are important parts of centrifugal pump.Their degree of precision and coupling production directly affect the performance of centrifugal pump water conservancy.In order to improve the flow loss generated atthe impeller and volute coupling, Pro/E is taken as the design platform. the analysis and mapping method of impeller and volute Wooden patterns 2D projection are put forward. Combined with Pro/E in the "offset coordinate datum point command" commands, the twisted blade and volute impeller entity modeling precision are realized through Fluent numerical simulation. The pressure and velocity distribution of impeller and volute coupling shows that pressure and velocity are uniform regularity, and head of delivery calculation shows that the design requirements meet design requirement.The analysis results show that this method is not only drawing accurate, but also is fast and flexible, and it can improve the flow loss of the coupling of the impeller and the volute, which lays the foundation for further numerical analysis.