1 National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, Jiangsu, China；
2 Sitael S.p.A., 5 via della Gherardesca, Pisa 56121, Italy
3. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
An axial-flow pump with the high specific speed of 1 500 r/min was chosen to investigate the effect of the matching between its impeller and diffuser on its hydraulic performances.An optimization method of orthogonal experiment was applied based on selecting seven kinds of geometric parameters of the corresponding impeller and diffuser as the optimized variables.In order to broaden the high-efficiency region of the axial-flow pump, the weighted average efficiency at the flow rates of 80%, 100% and 120% of the design flow rate was set as the goal, and 18 kinds of design schemes were finally obtained based on the L18(37) orthogonal test.Meanwhile, the numerical simulation of the steady inner flow in the axial flow pump were carried out to predict the hydraulic performances of the pump and the comparison among the 18 kinds of design schemes was conducted by using the SST k-ω turbulence model in ANSYS CFX14.5.The primary and secondary order of the geometric parameters that affect the aimed efficiency were studied through the range analysis, and an optimal parameter combination were obtained.The results show that: the weighted average efficiency of the axial-flow pump after optimization increases by 4.68%.Furthermore, the hydraulic efficiency of the optimized axial-flow pump is improved significantly at large flow rates with the value of the pump head basically unchanged.It is shown that the matching between the impeller and diffuser, like a pair of rotor and stator, has a significant effect on the hydraulic performances of axial-flow pumps.
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