摘要
为研究内置翅片参数对含内热源封闭腔内自然对流-辐射耦合传热的影响,在是否考虑内壁面辐射效应的基础上,对不同翅片单参数下腔内传热能力进行了数值分析对比,并就翅片多参数交互作用对腔内对流-辐射耦合传热效果的影响进行了响应面分析。结果表明:一定强度的壁面辐射有利于改善热源表面和冷壁面的对流换热效果。壁面辐射使得翅片附近的冷壁面局部Nu数波动程度有所增强,冷壁面平均Nu数相比无翅片工况最高提升了16.74%;无论是否考虑辐射,翅片单参数变化,翅片长度l对热源表面平均Nu数的影响最为显著,最优翅片单参数均依次为:θ=120°、l=0.02H、a=0.75H,考虑辐射对应的热源表面平均Nu数提升率η更高,分别为10.15%、11.03%、10.48%;引入响应面优化法,分析得出翅片长度与安装高度的交互作用对热源表面平均Nu数影响最显著,腔内对流-辐射耦合传热效率最高的翅片参数组合为:θ=117.94°,l=0.023H,a=0.734H,此时,热源表面平均Nu数为26.50,相比无翅片工况提升了13.15%。所得翅片参数影响规律及多目标优化结果反映各因素交互作用显著度的同时,也为改善工业装置封闭空间内发热元件对流冷却效果提供了理论指导。
In order to study the influence of built-in fin parameters on the natural convection-radiation coupled heat transfer in enclosed cavity with heat source,a comparative numerical analysis of the heat transfer capacity in the cavity under different fin parameters was carried out on the basis of whether the radiation effect of inner wall surface was considered.The influence of multi-parameter interaction of fin on convection-radiation coupled heat transfer effect in cavity was analyzed by response surface method.The results show that wall radiation of certain intensity is beneficial to improve the convective heat transfer effect of heat source and cold wall surface.Wall radiation enhances the fluctuation degree of local Nusselt number on the cold wall near the fin.The maximum value of the average Nusselt number on the cold wall increases by 16.74%compared with the non-fin condition.Regardless of whether the radiation is considered,the fin length l has the most significant effect on the average Nusselt number on the heat source surface.The optimal fin single parameters areθ=120°,l=0.02H,a=0.75H,respectively.When radiation was considered,the corresponding increase rates of the average Nusselt number on the heat source surface are 10.15%,11.03%,10.48%,respectively,becauseηis higher;The analysis of response surface optimization shows that the interaction between fin length and installation height has the most significant effect on the average Nusselt number of heat source surface,the fin parameters combination with the highest convection-radiation coupled heat transfer efficiency in cavity isθ=117.94°,l=0.023H,a=0.734H,the average Nusselt number of the heat source surface is 26.50,which is 13.15%higher than the non-fin condition.The influence laws of fin parameters and the multi-objective optimization results reflect the significance of the interaction of various factors,and also provide theoretical guidance for improving the convective cooling effect of heating elements in the closed space of industrial devices.
作者
第五嘉玮
王烨
胡润鑫
DIWU Jiawei;WANG Ye;HU Runxin(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Railway Vehicle Thermal Engineering,Ministry of Education of China,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2024年第2期117-127,共11页
Journal of Ordnance Equipment Engineering
基金
国家自然科学基金项目(51476073,52066009)
甘肃省自然科学基金项目(21JR7RA304)
兰州交通大学基础研究拔尖人才项目(2022JC48)
甘肃省高等学校产业支撑计划项目(2023CYZC-38)。
关键词
封闭腔
对流-辐射耦合传热
多参数优化
响应面法
数值模拟
enclosed cavity
convection-radiation coupled heat transfer
multi-parameter optimization
response surface method
numerical simulation
