Design,Numerical Simulation And Experimental Study On Vane Self-priming Vertical Pump

On the basis of comprehensive summarize of the research results of self-priming pump, this paper brings forward a new design method, and designs a new type of self-priming pump named vane self-priming vertical pump, improves and simplifies the structure of self-priming, raises the reliability of the applying of the pump, and finally achieves certain results. At present, we have experienced designed the vane centrifugal pump using the traditional design theory of centrifugal pump for many years, but the factors that influence the self-priming performance of vane self-priming vertical pump haven't been understood. We mainly depend on experience to choose the parameters, and the works to research the law of the internal flow field are very short. Therefore, by using ANSYS ICEM, CFX and with large eddy simulation method, the flow field in the vane self-priming vertical pump was analysis. And optimization design of pump body was also carried out, and then the model pump was produced, experimental study on the pump was done to compare to the simulation results.The main points of my work are outlined as follows:(1) Summarized the present state of the research and fruits of formers research, brought out a new design theory and method of vane self-priming vertical pump, and designed a new type of self-priming pump, this new pump belongs to the outer gas-liquid mixing type, and the impeller of the pump is closed style and hasn't set the volute casing. And the transformation of energy behind the impeller was carried through in the vane runner.(2) The three-dimensional objects of flow runner were modeled by using Pro/E, and mesh generation technique was briefly introduced, the non-structural tetrahedron mesh was selected, and the mesh was generated by applying ANSYS-ICEM.(3) The 3-D single liquid phase steady flow field in the vane self-priming vertical pump was simulated numerically by using CFX, and its internal flow characteristics were gained. The gas-liquid two phases in the pump was calculated, and the gas-liquid two phases flow field distribution in self-priming condition was described. 3-D unsteady numerical simulation was done by using large eddy model, and the unsteady fluctuation conditions in the pump were monitored, the analysis results show: the pressure fluctuation showed a regular cyclical change, the fluctuation obviously becomes smaller as the liquid flowed from the inlet to the outlet of pump. Finally, the pressure fluctuation of different flow rate was contrasted, it was found that the fluctuation becomes stronger as the flow rate is far from optimum operation point, and the condition of the large flow rate was better than the small flow rate.(4) In order to get the external characteristic rules, the internal flow fields of model pump under different work conditions were simulated. The important orders of parameters influences to performances were obtained, and the optimal parameters combination was got through orthogonal optimization method.(5) Performance test of vane self-priming vertical pump was accomplished, and the experimental results were contrasted to the performance prediction results. The design method of vane self-priming vertical pump was proved reasonable through experimental study. And the contrasted results assured the correctness of the selected models and calculation method.