排灌机械工程学报Issue(5)：373-377,5.DOI:10.3969/j.issn.1674-8530.13.0085
轴流泵运行工况和叶顶间隙对叶顶泄漏涡轨迹的影响
Influence of operational condition and tip clearance size on trajectory of tip leakage vortex
摘要
Abstract
Based on the SST k-ωturbulence model and vortex intensity method,the flow through the impeller tip and tip leakage vortex trajectory in a model axial-flow pump were simulated numerically. The influence of operational condition and tip clearance size on the trajectory was analyzed.It is shown that the starting point of leakage vortex core moves to the middle portion of blade from the blade leading edge gradually with increasing flow rate.The relative flow direction in the impeller passage is deflected and the trajectory of tip leakage vortex is altered accordingly under the entrainment induced by the pri-mary flow with increasing flow rate as well.Note that the slope of the vortex core trajectory also gets enlarged by the primary flow.The rollup of leakage vortex is enhanced and the affected region is ex-panded,the starting point of the vortex also moves from the leading edge to the trailing edge,and the static pressure in the vortex core is decreased gradually,causing a risk of cavitation with increasing tip clearance size.A positive head curve appears at around 0.9 times the design flow rate under a tip clearance as large as 1 .5 mm,suggesting the tip leakage vortex can influence the instability of head curve significantly.关键词
轴流泵/叶顶间隙/叶顶泄漏涡/流量/轨迹Key words
axial-flow pump/tip clearance/tip leakage vortex/flow rate/trajectory分类
农业科技引用本文复制引用
施卫东,邵佩佩,张德胜,吴苏青,李通通..轴流泵运行工况和叶顶间隙对叶顶泄漏涡轨迹的影响[J].排灌机械工程学报,2014,(5):373-377,5.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）；中国博士后基金面上和特别资助项目 （）
