高封闭方腔自然对流换热特性数值模拟研究  

Numerical Simulation of Natural Convection Heat Transfer Characteristics in High Closed Cuboid Cavity

作　　者：任嘉友 王子云[1] 齐润生 吴玉玲 REN Jia-you;WANG Zi-yun;QI Run-sheng;WU Yu-ling(College of Architecture and Environment,Sichuan University,Chengdu,Sichuan,China,Post Code:610065)

机构地区：[1]四川大学建筑与环境学院

出　　处：《热能动力工程》2019年第12期79-85,共7页Journal of Engineering for Thermal Energy and Power

基　　金：科技部国家重点研发计划“绿色建筑及建筑工业化”项目子课题(2016YFC0700400-2)~~

摘　　要：采用ANSYS Fluent 17. 0中的标准k-ε湍流模型对高度、深度及宽度比为28. 7∶6. 8∶1,瑞利数分别为0. 86×10^6、1. 10×10^6和1. 43×10^6的高方腔内的空气自然对流传热进行分析研究,结果显示:温度场及速度场在几何上呈现出良好的中心对称结构;随着瑞利数增大,自然对流增强,努塞尔数增大;在冷、热壁面附近区域,温度梯度大,热量传递以导热为主,越靠近中心区域,对流传热占总的传热比例增加;方腔顶部区域,冷板侧的传热相对更强,而在贴近底板区域,热板侧的传热相对更强。分析结果经过与实验结果对比,具有很好的一致性,模拟结果和方法可作为该类问题模拟分析的参考。In this paper,the natural convection heat transfer of air in a high enclosed cavity is investigated by using the standard k-ε turbulence model of ANSYS Fluent 17.0 for the conditions of the height∶depth∶width of the cavity of 28.7∶6.8∶1 and the Rayleigh numbers of 0.86×10^6,1.10×10^6,and 1.43×10^6,respectively.The results indicate that,the fields of temperature and velocity present satisfactory central symmetry.The intensity of the natural convection increases with the Rayleigh number,and accordingly,Nusselt number is increasing.In the vicinity of heat wall and cold wall,there is large gradient of temperature,the heat conduction is prominent,but near the center area,the portion of heat transfer is large.In the top area of the cavity,the strength of heat transfer is stronger proximity to the cold wall,however,in the bottom area of the cavity,the strength of heat transfer is stronger proximity to the hot wall.The analysis results are well consistent with the experimental results.The simulation results and method presented can be used as a reference for the simulation analysis of this kind of problems.

关 键 词：数值模拟 自然对流 高封闭方腔 中心对称 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]