防热复合材料高温炭化烧蚀过程的数值分析  

Numerical simulation of high-temperature carbonized ablation processes for thermal protective composites

作　　者：杨德军[1] 李旭东[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《功能材料》2013年第4期544-547,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50271016;50571042)

摘　　要：为了揭示在高温情况下防热复合材料发生炭化烧蚀时的详细热响应,通过有限元数值模拟方法实现了对复合材料炭化烧蚀过程的计算。建立了防热复合材料炭化烧蚀过程数值分析的有限元模型,主要包括内部热解反应,材料质量损失,传热模型,表面炭层剥蚀模型,并对某炭/酚醛复合材料的烧蚀过程进行了数值模拟。结果表明,材料的烧蚀是多种因素综合作用的结果,随着烧蚀时间增加,材料内部会出现热解反应,并且发生炭化层、热解层和原始材料层的分层现象,各层随着时间向材料内部移动。壁面温度随着烧蚀量的增大而减小,材料的炭化烧蚀有效地起到了热防护效果。数值模拟结果满足研究项目要求。研究方法对任意的炭化烧蚀热防护材料均具有适应性。In order to reveal the detailed thermal response of thermal protective composites under high temperature,the carbonized ablation process of composite materials is achieved through the method of finite element numerical simulation.Established a thermal composite finite element model for numerical analysis of ablation process of carbide primarily include internal pyrolysis,material quality loss,heat transfer modeling,carbon coating on the surface of erosion models,and the ablation process of carbon-phenolic composites is numerical simulated.Results show that ablation of the material is the result of combination of a variety of factors,with the ablation time increases,material internal pyrolysis reaction occurs,and the occurrence of layered phenomenon causing the materials been divided into carbide layer,pyrolytic layer and original material layer and the material layer moving over time to the inside material.The wall temperature decreases with the increase of the ablation volume of the material,and the carbonation ablation of materials has played an effective thermal protective effect.The results of numerical simulation meet the requirements of the research program.The research method is applicable for any carbide ablative thermal protection materials.

关 键 词：复合材料 烧蚀 数值模拟 热解反应 烧蚀率 

分 类 号：TB33[一般工业技术—材料科学与工程] TP391.9[自动化与计算机技术—计算机应用技术]