基于正交试验的高扬程混流泵优化设计

为了提高高扬程导叶式混流泵的扬程和效率,选择叶轮叶片进、出口安放角、包角和叶轮外径等4个因素,每个因素取4个水平,利用正交设计软件SPSS进行正交试验方案的设计,应用CFD软件ANSYS CFX对设计的16副叶轮进行三维数值模拟,利用极差分析的方法分析得到各因素对扬程和效率的影响程度,进而得到最优组合方案,最后对比分析原始模型与优化模型的内部流动情况,验证优选方案的可行性.结果表明:叶轮叶片出口安放角对扬程影响程度最大,叶片包角对效率影响程度最大.在设计流量下,兼顾扬程和效率所选出的最优方案扬程和效率均有所提高,泵段内水流流态较好,压力分布均匀,达到优化设计的目的.因此,基于正交试验的高扬程混流泵优化可行,优化方案的参数搭配能够有效地减小高扬程混流泵的水力损失,提高其水力性能,并改善其内部流动.

Optimization design of mixed-flow pump with high head based on orthogonal test

The orthogonal design software SPSS was used to design the orthogonal test scheme of four factors and four values including inlet angle, outlet angle, wrap angle, outer diameter of impeller, etc. Three-dimensional numerical simulation of the 16 designed impellers were carried out with CFD software ANSYS CFX. Range analysis was used to analyze the influence of various factors on the head and efficiency. Then an optimal scheme was put forward. The feasibility of the preferred scheme was verified by comparing and analyzing the internal flow of the original model and the optimized model. The results show that the outlet angle has the greatest influence on the head, and the blade wrap angle has the greatest influence on the efficiency. At the designed flow rate, the head and efficiency of the optimum program to both head and efficiency were improved. The flow pattern in the pump section was better and the pressure distribution was uniform, which is up to the optimal goal. Therefore, the optimization of the high-head mixed-flow pump based on the orthogonal test is feasible. The parameters of the preferred scheme can effectively reduce the hydraulic loss of the high-head mixed-flow pump and improve its hydraulic performance and internal flow.