农业机械学报2012，Vol.43Issue(3)：73-77,5.DOI:10.6041/j.issn.1000-1298.2012.03.014
轴流泵叶轮端壁区流动特性数值模拟
Numerical Simulation of Flow Field Characteristics in Tip Clearance Region of Axial-flow Impeller
摘要
Abstract
The flow in end wall region of axial-flow impeller has an important impact on flow structure, energy transfer and hydraulic efficiency. The hydraulic axial-flow pump models with different tip clearance sizes were simulated based on CFD technology and high-quality structured grid. The influence of tip clearance on the meridional velocity and circulation distributions in impeller inlet and outlet were discussed, and the leakage vortex generation mechanism and its structure were analyzed as well. The numerical results were compared with high-speed photography experimental results. The investigation results showed that tip clearance led to non-uniform meridional velocity distribution in impeller inlet and secondary flow in end wall region occurred, meridional velocity near tip clearance in impeller outlet decreased, and the bigger the gap was, the bigger decline of meridional velocity would be. The secondary recirculation near the wheel led to circulation of impeller inlet, when the gap increased to 2 mm, about 50% of the whole flow passage appeared circulation which impacted by the tip leakage vortex. The trajectory and structure of tip leakage vortex in the numerical simulation showed agreement with the experimental results. Under the small flow rate conditions, the leakage vortex strength and the influence regional scale were increased.关键词
轴流泵/叶顶泄漏涡/轴面速度/环量/数值模拟Key words
Axial-flow pump/Tip leakage vortex/Meridional velocity/Circulation/Numerical simulation分类
机械制造引用本文复制引用
张德胜,施卫东,张华,李通通,张光建..轴流泵叶轮端壁区流动特性数值模拟[J].农业机械学报,2012,43(3):73-77,5.基金项目
国家自然科学基金资助项目(51109093、51079063)、江苏省自然科学基金资助项目(BK2011503)、国家博士后科学基金资助项目(2011M500117)、东南大学水声信号处理教育部重点实验室开放研究基金资助项目(UASP1006)、江苏大学高级人才启动基金资助项目(11JDG038)和江苏省博士后基金资助项目(1101019B) （51109093、51079063）
