基于共轭传热的火灾条件下复合材料储氢瓶的传热行为  

Heat Transfer Behavior of Composite Hydrogen Cylinder Based on Conjugate Heat Transfer Subjected to Fire Impingement

作　　者：程崇律 徐宝鹏[1] 孔凡夫 Cheng Chonglü;Xu Baopeng;Kong Fanfu(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院

出　　处：《燃烧科学与技术》2020年第1期51-59,共9页Journal of Combustion Science and Technology

基　　金：教育部留学归国人员科研启动基金资助项目(ZX20150008)

摘　　要：复合材料储氢瓶为氢燃料电池汽车的关键部件,其在火灾条件下的瞬态传热行为的精准预测对储氢瓶的失效判断至关重要.文中提出了一种基于多重区域的实时双向耦合共轭传热模型,用于模拟复合材料储氢瓶在火灾条件下的瞬态传热特性.共轭传热模型采用大涡模拟(LES)对瓶外流体计算区域的火灾进行了数值模拟,并对复合材料缠绕层、高密度聚乙烯内胆和瓶内高压氢气3个计算区域分别建立了基于有限体积法的三维导热方程.复合材料缠绕层的导热模型考虑了高温热解和热解气的对流及冷却作用,并采用了依赖于复合材料成分和温度的可变物性.结合某商用Ⅳ型储氢瓶的池火火灾试验,验证了所提出的共轭传热模型的可靠性,并对其瞬态传热特性进行了数值研究.Composite hydrogen cylinder is a key component of hydrogen fuel cell vehicles,and the accurate prediction of its transient heat transfer behavior subjected to fire impingement is essential to its failure criterion.In this paper,a two-way coupled conjugate heat transfer model based on a multi-region approach is proposed for modelling the transient heat transfer behavior of composite hydrogen cylinders.The fire is modelled using large eddy simulation(LES),and three-dimensional governing equations based on the finite volume method are established to model the heat transfer through the regions of composite laminate,HDPE liner and pressurized hydrogen,respectively.The effects of the gas decomposition of composite material and the volatile gas transport are taken into account,and the variable physical properties relying on composite material composition and temperature are adopted.The proposed conjugate heat transfer model is validated against a bonfire test of a commercial Type-4 cylinder,and its transient heat transfer characteristics are also studied in detail.

关 键 词：复合材料储氢瓶 大涡模拟 共轭传热 火灾 热解 

分 类 号：TK91[动力工程及工程热物理]