Optimized Design of the Impeller of a Non-overload Vortex Pump Based on the Orthogonal Design Method

By choosing five factors,namely,impeller outer diameter,impeller outlet width,blade outlet installation angle,number of blades and bladeless cavity width,and 2 levels for each factor,formulated was a L8(27) orthogonal test scheme and explored was the law of the geometrical parameters influencing the efficiency,head and shaft power.The basic parameters of the vortex pump were as follows:Q=50 m3/h,H=8 m and n=1 470 r/min.For each combination in the orthogonal design,the performance was predicted by using the fluid dynamics software Fluent.The optimum schemes for each performance were identified by analyzing the chart for contrasting the performance curves.According to the ranges,the results were analyzed and compared with a group of the combinations of optimum parameters being obtained.In the light of the simulation results,the model pump was designed and a test was performed.The test results are basically in agreement with the numerical simulation results,verifying that the numerical calculation method in question is effective and reliable.The test results show that the model pump can meet the design requirements,keeping a relatively high efficiency and a relatively wide high efficiency zone at the same time of realizing an operation without any overload.The test results can offer useful reference for further studying the hydrodynamic performance of a non-overload vortex pump and optimizing the design methods.