三角对翼和圆柱组合强化螺旋通道换热的数值研究  

Numerical Research on Heat Transfer Enhancement in Helical Channel with Combination of Delta Wings and Cylinder

作　　者：戴玉龙[1] 王翠华 Dai Yulong;Wang Cuihua(Guidaojiaotong Polytechnic Institute,Shenyang 110023,China;School of Energy and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]辽宁轨道交通职业学院,辽宁沈阳110023 [2]沈阳化工大学能源与动力工程学院,辽宁沈阳110142

出　　处：《山东化工》2019年第17期150-152,共3页Shandong Chemical Industry

基　　金：辽宁省博士启动基金(201601195)

摘　　要：本文旨在研究三角对翼和柱形涡发生器组合后强化矩形螺旋通道内流体换热的特性。采用CFD模拟的方法分析了对翼攻角α、无量纲参数高度hi'对螺旋通道内流体流动和换热的影响。结果表明:三角翼采用下降流型布置时,在柱后θ=10°的截面上二次流呈四涡结构,加速尾迹区与主流流体的混合,强化了传热;在所研究范围内,α增大,组合涡发生器强化传热效果先增大后减小,在攻角α=30°时强化传热效果最优;其它参数相同时,三角翼hi'增大,螺旋通道的Nu和阻力系数f均增大,但综合因子G减小。Heat transfer characteristics in the rectangular helical ducts with combination of delta wings and cylinder were investigated.The effects of the attack angle of delta wing (α) and the dimensionless height ( h i') on turbulent flow and heat transfer in rectangular helical channels were researched numerically used CFD method.The results show that the secondary flow in the cross section of θ=10° presents a four-vortex structure when the delta wings are deployed in a downward flow pattern,which accelerates the mixing of the wake region and the mainstream region and then heat transfer enhancement has been achieved.In the studied range,the enhanced heat transfer performance of combinational vortex generators is increased first and then decreased as α increases.When α=30°,the effect of enhanced heat transfer is optimum.For constant other parameters,with the increase of h i',both the Nusselt number and resistance coefficient of the helical duct with combinational vortex generators increased,but the comprehensive factor G decreased.

关 键 词：螺旋通道 矩形截面 A形翼 强化传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]