化工学报2016，Vol.5Issue(5)：1814-1821,8.DOI:10.11949/j.issn.0438-1157.20151623
翼型涡发生器对半圆形螺旋通道的换热强化机理
Enhanced heat transfermechanism of winglet vortex generator in helical channel with semicircular cross section
摘要
Abstract
The purpose of this paper is to obtain the enhanced heat transfer characteristic of the winglet vortex generator (VG) in the helical channel with semicircular cross section. The shape and layout of the VG are concerned. CFD software is adopted to simulate the fluid flow and heat transfer characteristic in the smooth helical channel and that installed with four kinds of winglet vortex generator. The four styles of vortex generator are characterized as jxjs, jxjk, sjjs and sjjk VG, respectively. The simulated data coincide well with the experimental data. The results based on the current research show that after installing the vortex generator, the average ratio ofNum toNu0 is in the range of 1.044—1.074 whereNum is the surface average Nusselt number of helical channel within the scope of ±180o away from the vortex generator andNu0 is the corresponding value of smooth helical channel. However, the specific value between the flow resistance coefficientof helical channel with VG and the corresponding value of smooth channel,i.e.f/f0 is in the range of 1.105—1.188. The rectangular winglet VG is superior to the triangular winglet VG only in terms of heat transfer enhanced. Along with the flow direction, the convergent layout of VG is superior to the divergent layout for heat transferring. Based on the fieldsynergy principle, the secondary flow field structure would be changed by the vortices shedding from the VG. Thus, the cooperativity of flow and temperature fields would be better and the heat transfer would be improved. For the helical channel with rectangular and triangular winglet VG, the compound secondary flow fields are four vortices and two large vortices, respectively, and the length of heat transfer effect is 10.47 and 12.56 times of winglet height, respectively.关键词
螺旋通道/翼型涡发生器/传热/流动/数值模拟/场协同Key words
helical channel/winglet vortex generator/heat transfer/flow/numerical simulation/field synergy分类
能源科技引用本文复制引用
李雅侠,张腾,张春梅,张丽,吴剑华..翼型涡发生器对半圆形螺旋通道的换热强化机理[J].化工学报,2016,5(5):1814-1821,8.基金项目
国家自然科学基金项目(51506133) （51506133）
辽宁省教育厅一般项目(L2014165) （L2014165）
辽宁省博士科研启动基金项目(20141085).supported by the National Natural Science Foundation of China (51506133), the Foundation of Liaoning Educational Committee (L2014165) and the Doctoral Science Research Foundation of Liaoning Province (20141085). （20141085）
