端壁间隙流动对轴流泵性能影响分析

摘要

This paper uses CFD calculation tool FLUENT, based on N-S equation, and the SMPLEC algorithm and takes the standard K turbulence model numerically simulated to calculate the clearance sizes which are 0.5%, 1%, 1.5%, 2% relative to the diameter of runner size under different flow of axial-flow pump tip clearance flow and also to the axial-flow pump field band gap flow. The results show that the size of the gap affects the blade captations performance and efficiency of pump and lift. These have great influence on pump's performance. It provides the reliable theoretical basis of improving the performance of axial-flow pump.%采用CFD计算工具FLUENT,基于N-S方程,采用标准K-ε紊流模型,以及SMPLEC算法,取间隙大小δ相对于转轮直径大小的0.5％、1％、1.5％、2％,对以上4种不同间隙在不同流量下轴流泵端壁间隙流动进行了数值模拟,同时也对轴流泵内部带间隙的流场进行了数值分析.结果显示:间隙的大小,影响着叶片的空化性能和水泵效率及扬程,对泵的性能有着巨大的影响.给今后轴流泵的设计改进提供了可靠的理论依据.