各向异性多孔材料流动换热特性数值研究  

A Numerical Study on Flow and Heat Transfer Characteristics of Anisotropic Porous Material

作　　者：孔祥壮 张超 杜雁霞[2] 王娴[1] 肖光明[2] KONG Xiangzhuang;ZHANG Chao;DU Yanxia;WANG Xian;XIAO Guangming(State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]西安交通大学航天航空学院机械结构强度与振动国家重点实验室,西安710049 [2]中国空气动力研究与发展中心空气动力学国家重点实验室,绵阳621000

出　　处：《工程热物理学报》2024年第11期3465-3473,共9页Journal of Engineering Thermophysics

基　　金：国家重点研发计划资助项目(No.2019YFA0405202);国家自然科学基金项目(No.12272288)。

摘　　要：由于多孔材料具有优异的强化换热能力,在新型热防护系统中被广泛应用。本文以断层扫描获得的多孔材料切片为研究对象,采用分水岭算法对材料各向异性进行表征,结合双分布格子-Boltzmann方法对其流动换热特性进行研究。结果表明:流动沿骨架未拉伸方向时,流动路径更曲折,涡系结构更复杂,导致渗透率更小,换热能力更强,且不同方向渗透率之比与结构各向异性因子在数值上基本相同,说明多孔材料不同方向流通能力受结构各向异性影响。在过渡区,多孔材料不同方向换热能力的差异随雷诺数增大逐渐增大;在达西区和强惯性区,不同方向换热能力的差异不随雷诺数变化。Due to excellent enhancement of heat transfer capabilities,porous materials have been widely used in new thermal protection systems.In this paper,the porous material slices obtained by tomography imaging were studied,and the anisotropy of the material was characterized using the watershed algorithm.The flow and heat transfer characteristics were investigated using the dual distribution lattice Boltzmann method.The results show that when the flow is along the direction of the unstretched skeleton,the flow path is more tortuous and the vortex structure is more complex,leading to smaller permeability and stronger heat transfer capability.The ratio of permeability in different directions and the anisotropy factor of the structure are numerically similar,indicating that the flow capacity in different directions of porous materials is influenced by the structural anisotropy.In the Transitional region,the difference in heat transfer capabilities in different directions of the porous material increases with increasing Reynolds number,while in the Darcy and Forchheimer regions,the difference in heat transfer capabilities in different directions does not change with Reynolds number.

关 键 词：多孔材料 格子-BOLTZMANN方法 各向异性 渗透率 换热能力 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]