基于正交试验的低比转数混流泵叶轮和导叶匹配优化

Matching Optimization of the Impeller and Guide Vane of Mixed Flow Pumps with A Low Specific Speed Based on Orthogonal Experiments

为提高比转数为300的导叶式混流泵在设计工况下的水力效率,以叶轮进、出口安放角、包角、直径以及导叶进、出口安放角和包角作为设计参数,采用标准正交表中7因素3水平正交试验方案进行方案设计,使用商业软件CFX对18组混流泵设计方案进行三维数值模拟,首先利用极差分析法得到各因素对扬程和效率的影响程度,然后按照设计要求选取最优方案,最后对比分析优化前后的内部流动情况,探究最优方案外特性参数提高的原因。结果表明:叶轮出口安放角对扬程和效率影响最大,导叶出口安放角对扬程和效率的影响最小。在设计流量下,最优方案扬程符合优化目标,效率有显著提高,整体流态得到改善,达到优化设计的目的。

In order to improve the hydraulic efficiency of the guide vane mixed flow pump with a specific speed of 300,the standard orthogonal table is used to design the orthogonal test scheme of seven factors and three values including inlet and outlet angle,wrap angle,diameter of impeller and inlet and outlet angle,wrap angle of guide vane.Three-dimensional numerical simulation of the 18 mixed-flow pump designs is carried out with commercial software CFX.Range analysis is used to analyze the influence of various factors on the head and efficiency.The best program is selected according to the design requirements.Finally,by comparing and analyzing the internal flow before and after optimization,the reasons for the increase in the external characteristic parameters of the optimal plan are analyzed and explored.The results show that the installation angle of the impeller outlet has the greatest influence on the head and efficiency,and the installation angle of the guide vane outlet has the least influence on the head and efficiency.Under the design flow rate,the head of the optimal plan meets the optimization goal,the efficiency is significantly improved,and the overall flow pattern is improved to achieve the purpose of optimization design.