倾角对含内热源封闭方腔内湍流自然对流换热影响  

Effect of Inclination Angle on Turbulent Natural Convection Heat Transfer in A Square Enclosure with Internal Heat Source

作　　者：马兵善 王烨[1,3] 赵兴杰[1] MA Bing-shan;WANG Ye;ZHAO Xing-jie(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of RailwayVehicle Thermal Engineering,Ministry of Education of China,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州理工大学土木工程学院,兰州730050 [3]兰州交通大学铁道车辆热工教育部重点实验室,兰州730070

出　　处：《兰州交通大学学报》2021年第4期79-87,共9页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金资助项目(51476073,51266004);甘肃省建设科技攻关项目(JK20162)。

摘　　要：为了研究腔体倾角和内热源位置对封闭腔内对流冷却效果的影响规律,采用RNG kε模型和DO辐射模型对有内热源、上下壁面导热的封闭腔内湍流自然对流耦合传热特性进行了数值分析.结果表明:使得热壁面总的平均努塞尔数取得最大值的热源距热壁面的无量纲最佳长度D=0.5,腔体最佳倾角φ=75°,比D=0.4、φ=0°时提高了20.5%;热壁面平均辐射努塞尔数对热源位置的敏感性较腔体倾角φ强;腔体热壁面上Nu total为表面发射率的增函数.To study the influence of inclination angle and the position of internal heat source on the convection cooling effects in the enclosure,RNG kεand DO radiation model are adopted to numerically analyze the turbulent natural convection heat transfer inside an air filled inclined enclosure with internal heat source and heat conduction on the upper and lower walls.The results show that the total average Nusselt number on the hot wall at the optimum inclination angleφ=75°and the optimum dimensionless length D=0.5 between the inner heat source and the hot wall has been improved by 20.5%than that atφ=0°and D=0.4.The sensitivity of the average radiation Nusselt number for the position of heat source is more sensitive than that of the inclination angle.The total average Nusselt numbers on the hot wall is an increasing function of surface emissivity.

关 键 词：湍流自然对流 耦合传热 内热源 辐射 倾角 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]