缝隙引流叶轮的优化设计

Optimal Design of Centrifugal Pumps with Gap Drainage Blades

以带缝隙引流叶片的低比转速离心泵叶轮为研究对象,研究了缝隙引流叶片的位置对低比转速离心泵水力性能的影响.基于叶片参数化设计、网格划分、CFD(computational fluid dynamics)计算和后处理过程全自动集成的优化平台,以离心泵叶轮水力效率最大化为目标函数,采用实验设计法(design of eXperiments,DOE)和序列二次规划法(sequential quadratic programming,SQP)组合策略进行优化设计.将优化后得到的新叶轮和原始叶轮进行对比分析发现,优化后泵流道内堵塞情况减少,扬程提高,0.6Q工况以后优化叶轮的效率比原始叶轮高,同时最高点效率提高了2%以上.研究结果表明,该设计方法切实可行.

The impact of gap drainage blades＇ position on the hydraulic performance of a low specific speed centrifugal pump is studied.A fully automatic integrated optimization platform is used,which includes blades parametric design,meshing,computational fluid dynamics （CFD） calculations and post-processing.The hydraulic efficiency maximization of a centrifugal pump impeller is taken as the objective function.Design of experiments （DOE） and sequential quadratic programming （SQP） are used for optimal design.The comparison between the optimal impeller and the original impeller shows that the jam effect has been reduced,and the head improved.Specifically,efficiency of the optimal impeller is higher than the original after the condition 0.6Q,and the maximum efficiency point is improved by 2%.The results indicate feasibility of the design method.