壁面扰流影响边界层湍流拟序结构及强化传热机理的研究  

The Study of Heat Transfer Enhancement by Influence of Flow around Vortex Generators on the Turbulent Coherent Structure

作　　者：温娟[1] 丁京伟[2] 齐承英[1] 杨历[1] 

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]中国汽车技术研究中心汽车试验研究所,天津300162

出　　处：《河北工业大学学报》2009年第3期5-12,共8页Journal of Hebei University of Technology

基　　金：国家自然科学基金资助(50676027)

摘　　要：从涡流发生器对湍流边界层拟序结构影响的角度来研究强化传热机理.利用计算流体力学软件FLUENT6.3对流体在放置斜截半椭圆柱式涡流发生器矩形槽道内的流动与传热特性进行大涡模拟(LES),得出流场中速度、涡量、温度与压力参数的瞬态变化特性,并对新型涡流发生器的特性及其对湍流拟序结构的影响进行了分析,得知拟序结构的控制对强化传热起着重要的作用.通过研究拟序结构对流场及温度场的影响,揭示了强化传热的机理,进而为寻求适合的壁面扰流元形式和结构参数,为实现传热强化和流动减阻打下基础.This paper investigated heat transfer enhancement mechanism by the influence of vortex generators on the coherent structure of turbulent boundary layer. The flow and heat transfer characteristics of rectangle channel with bevel-cut half-elliptical column vortex generators are obtained with large eddy simulation （LES） and by using the hydromechanics software FLUENT6.3. The instantaneous properties of velocity, temperature and pressure in channel are gaind. The characteristic of vortex induced by inclined-cut semi-ellipse vortex generator and its influence on turbulent coherent structure are analyzed. Based on the results, the control of the coherent structure induced by vortex generator plays more important role in heat transfer enhancement. Furthermore, turbulence coherent structure directly affects the temperature gradient at the wall and the heat transfer enhancement mechanism of vortex generator is explained. In order to achieve enhanced heat transfer and flow of drag reduction, the suitable form of vortex generator and structure parameters can be sought.

关 键 词：涡流发生器 强化传热 拟序结构 斜截半椭圆柱 大涡模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]