竖井贯流泵装置内部流动数值模拟与性能分析

Numerical simulation of 3D internal flow and performance analysis of the shaft tubular pump system

优化竖井贯流泵装置的水力性能,应了解包括转轮在内的竖井贯流泵装置的流动特性。采用一维水力设计方法设计了竖井贯流泵装置的进、出水流道,并采用ANSYS CFX软件对前、后置竖井贯流泵装置进行三维定常流动数值模拟。引入平均涡漩角的概念,分析了前、后置竖井贯流泵装置内部流动的差异性,重点对不同形体的进、出水流道的水力性能及前、后置竖井贯流泵装置的外特性进行了分析比较,并通过模型试验得到了前置竖井贯流泵装置的综合特性曲线。结果表明,竖井与直管进水流道水力性能差异较小,出水流道对泵装置能量性能的影响较大。在叶片安放角0°时,前置竖井贯流泵装置最高效率为77.79%,后置竖井贯流泵装置最高效率为78.82%。本文可为竖井贯流泵装置设计及形式选择提供有益参考。

To optimize the hydraulic performance of shaft tubular pump system design, the flow characters of whole passage including the runner should be understood. A CFD code ANSYS CFX was applied to the three-dimensional full-passage simulation of a shaft tubular pump, and one-dimensional hydraulic design method was used to design the shaft. Two shaft designs, front-position design and post-position design, were studied and compared to find the difference between their pump internal flows. For them, the hydraulic performances of different inlet and outlet passages and the external flows are compared quantitatively in detail, and the average swirl angles at the outlet are also compared. The synthetic characteristic curves of the corresponding model pump system were obtained by physical model tests. The results show that the difference in the inlet passage flows between the two designs is little, while the difference in the outlet passage flows has a great influence on the energy performance of the pump system. The peak efficiencies of front-position and post-position shaft tubular pumps at the blade angle of 0° are 77.79 % and 78.82% respectively. This study would provide a reference for design and type selection of shaft tubular pump system.