基于正交设计法的潜水泵空间导叶水力优化

运用正交设计法,对井用潜水泵空间导叶进行优化设计,选取潜水泵空间导叶的进口宽度、导叶叶片轴向长度及导叶叶片出口边与导叶场域出口轴向距离,以扬程、效率及轴功率作为评价指标,基于正交设计法设计了9组方案.通过数值计算及极差分析结果表明:导叶叶片轴向长度对潜水泵扬程和轴功率影响显著,导叶进口宽度对潜水泵效率变化较为敏感,保证一定的导叶叶片与导叶场域出口距离能改善潜水泵性能.基于多目标优化设计,可以确定本次研究的最佳方案组合为空间导叶进口宽度25 mm、导叶叶片轴向长度101 mm及导叶叶片出口边与导叶场域出口轴向距离20 mm.通过分析前三级叶轮效率、导叶出口静压及流线分布图看出,优异的空间导叶设计使导叶内部流体状态较好,保证叶轮效率维持较高水平,同时泵内流体保持较好的流动稳定性.

Hydraulic optimization of spatial guide vane on submersible well pump based on the orthogonal design

The orthogonal design method is used to optimize design of a submersible well pump spatial guide vane. Three main geometric parameters of the submersible well pump spatial guide vane are selected, which are the inlet width, the axial length of the guide vane blade and the axial distance between the outlet edge of the guide vane blade and the field exit of the guide vane respectively. Nine groups of schemes are designed on the basis of the orthogonal method. All results from our numerical calculations and range analyses show that the axial length of the guide vane blade has a significant effect on the head and shaft power of the submersible well pump, and the inlet width of the guide vane is more sensitive to variation of the submersible well pump efficiency. The performance of the submersible well pump can be improved by fixing a certain outlet distance between the outlet edge of the guide vane blade and the field exit of the guide vane. Based on multi-objective optimization design methodology, the optimal scheme of this investigation is determined as follows: the inlet width is 25 mm, the axial length of the guide vane blade is 101 mm and the axial distance between the outlet edge of the guide vane blade and the field exit of the guide vane may take 20 mm.By further analyzing efficiency of the first three stages of the impeller and the static pressure and streamline distribution at the exit of the guide vane, it is found that current excellent design of the spatial guide vane makes the internal fluid state of the guide vane better and ensures the impeller efficiency to maintain a higher level. At the same time, the flow stability in the submersible well pump becomes better.