排灌机械工程学报2013，Vol.31Issue(5)：384-389,6.DOI:10.3969/j.issn.1674-8530.2013.05.004
混流泵内部流动不稳定特性的数值模拟
Numerical simulation of unstable characteristics in head curve of mixed-flow pump
摘要
Abstract
The three-dimensional unsteady flow field in a mixed-flow pump was calculated by means of the large eddy simulation (LES),sub-grid scale model and sliding mesh technique in order to analyze the instability in head curve and flow characteristics caused from the interaction between impeller and guide vane in the pump under low flow rate conditions.The experimental results showed the head-capacity curve exhibits a positive slope at 60％ Qd and 85％ Qd operating conditions,and the error between predicted and experimental results is less than 4％,suggesting LES can predict the positive slope characteristic accurately.On this basis,the flow mechanism for the unstable characteristic was analyzed.The simulated results showed that the fluid tangential velocity is distributed non-axisymmetrically in the impeller inlet evidently.Because of the stall of flow in the impeller and guide vane passages,there is a large scale vortex structure on the blade surface and the hub surface at the leading ledge of guide vane.The scale of the vortices in the guide vane passages is larger than that in the impeller.It is apparent that the pressure fluctuates periodically along the axial direction,allowing the vortex zone extends into the middle of guide vane passage from the suction side of guide vane.The core of large scale vortex is attached to the suction side at the middle span of the guide vane where pressure fluctuation is minimal; moreover,the rotational direction of the core is the same as the impeller.关键词
混流泵/失速效应/动静干涉/压力脉动/大涡模拟Key words
mixed-flow pump / stalling effect / rotor-stator interaction / pressure fluctuation /large eddy simulation分类
农业科技引用本文复制引用
黎义斌,李仁年,王秀勇,赵伟国,李鹏辉..混流泵内部流动不稳定特性的数值模拟[J].排灌机械工程学报,2013,31(5):384-389,6.基金项目
"十二五"国家科技支撑计划项目(2013BAF01B02) （2013BAF01B02）
国家自然科学基金资助项目(51269011) （51269011）
甘肃省自然科学基金资助项目(2011GS04264) （2011GS04264）
