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V-型皱褶芯材一体化热防护结构等效热传导系数预测 预览

Prediction of Effective Thermal Conductivity of an Integrated Thermal Protection System based on V-pattern Folded Core
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摘要 皱褶芯材夹层结构经过合理的设计,可作为一体化热防护结构应用于航空航天领域。以 V-型皱褶芯材一体化热防护结构作为研究对象,给出了针对 V-型皱褶芯材等效热传导系数的修正混合定律,从而建立了结构沿厚度方向的一维等效传热模型。同时,对详细的三维模型进行稳态传热分析,得到了由拉丁超立方抽样方法生成的各个样本点的等效热传导系数,并与采用修正混合定律计算得到的结果进行了对比。最后,在典型再入环境下进行瞬态传热分析,对比了三维模型和一维模型各部分的温度变化。经过修正的混合定律能够较精确地描述等效热传导系数;基于该等效热传导系数的一维模型可有效地预测沿结构厚度方向各点的温度响应。 Folded core sandwich structures can be suitably designed to work as an integrated thermal protection system (ITPS) in aerospace industry. A V-pattern folded core-based ITPS is considered. Effective thermal conductivity through the core thickness is obtained using a modified rule of mixtures, based on which a one-dimensional (1-D) equivalent thermal model is established. In the meantime, steady state analyses of a detailed three-dimensional (3-D) model are conducted to obtain the effective thermal conductivities for samples generated using Latin Hypercube Sampling method, which are then compared with those from the modified rule of mixtures. Afterwards, comparisons are conducted between the 3-D and 1-D thermal models for transient heat transfer analyses under typical re-entry environment. The results show that the modified rule of mixture is fairly accurate compared with the numerical simulation results, and the 1-D thermal model is able to predict the temperature variation with time through the ITPS thickness satisfactorily.
作者 周晨 王志瑾 候天骄 Zhou Chen;Wang Zhi-jin;Hou Tian-jiao(Minister Key Discipline Laboratory of Advanced Design Technology of Aircraft, Nanjing University of Aeronautics and Astronautics,Nanjing, 210016;College of Aeronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016)
出处 《导弹与航天运载技术》 CSCD 北大核心 2019年第3期21-28,共8页 Missiles and Space Vehicles
基金 江苏省普通高校研究生科研创新计划资助项目(CXLX13_163) 中央高校基本科研业务费专项资金资助(NZ2016101) 江苏高校优势学科建设工程资助项目.
关键词 皱褶芯材 传热分析 热传导系数 热防护 温度响应 folded core heat transfer analysis thermal conductivity thermal protection temperature response
作者简介 周晨(1989-),男,博士研究生,主要研究方向为飞行器设计;王志瑾(1963-),女,教授,博士生导师,主要研究方向为飞行器结构设计与优化;候天骄(1993-),女,硕士研究生,主要研究方向为飞行器结构设计.
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