基于响应面法的轴流泵结构参数匹配研究

Structural Parameter Optimization of Axial Flow Pump Based on Response Surface Method

为减小叶轮出口到导叶进口之间的水力损失,选取比转速为1296的轴流泵作为研究对象,通过响应面分析和数值模拟相结合的方法,研究叶轮、导叶不同结构参数的匹配关系对水力效率的影响。将叶轮出口角修正系数ξ、导叶进口冲角Δβ、轴向间距S作为优化设计变量,泵的效率作为响应值,建立了优化变量与水力效率之间的多元二次回归方程。研究结果表明,导叶进口冲角Δβ对轴流泵性能的影响最大,其次为轴向间距S,叶轮出口角修正系数ξ的影响最小。此外,导叶进口冲角Δβ与叶轮出口角修正系数ξ均与轴向间距S有明显交互作用。依据优化变量的取值范围,得到了最优参数组合为ξ=1.2,Δβ=-0.7°,S=8.5 mm。优化后的轴流泵在设计工况下扬程提高了0.61 m,效率提高了2.6%。研究结果为进一步提升轴流泵水力性能提供了参考。

In order to reduce hydraulic losses between the outlet of the impeller and the inlet of the guide vane,an axial flow pump with a speed ratio of 1296 was selected as the research object.By combining response surface analysis and numerical simulation,the influence of different structural parameters of the impeller and guide vane on the hydraulic efficiency was studied.The correction coefficient of the impeller outlet angleξ,inlet incidence angle of guide vaneΔβ,and the axial spacing S were selected as the optimization design variables,while the pump efficiency was taken as the response value.A multivariate quadratic regression equation was established to describe the relationship between the optimization variables and hydraulic efficiency.The research results show that the inlet incidence angle of guide vaneΔβhad the greatest impact on the performance of the axial flow pump,followed by the axial spacing S,while the influence of the correction coefficient of the impeller outlet angleξwas the smallest.Furthermore,both the guide vane inlet incidence angleΔβand the impeller outlet angle correction coefficientξhad a significant interaction with the axial spacing S.Based on the range of values for the optimization variables,the optimal parameter combination was determined asξ=1.2,Δβ=-0.7°,and S=8.5 mm.After optimization,the axial flow pump showed a 0.61 m increase in lift and a 2.6%increase in efficiency under the design operating conditions.The research results provide a reference for further improving the hydraulic performance of axial flow pumps.