纳米复合隔热材料高温等效导热系数辨识方法  

Inverse method for retrieving high-temperature effective thermal conductivity of nanocomposite thermal insulation

作　　者：刘华[1] 解向前 金子程[1] 夏新林[1] 艾青[1] 李东辉[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001 [2]北京临近空间飞行器系统工程研究所空间物理重点实验室,北京100076

出　　处：《中国科学院大学学报（中英文）》2018年第2期216-221,共6页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(51536001;51676055)资助

摘　　要：搭建高温瞬态热特性实验装置,测量获取某纳米复合隔热材料在290~1 090 K温度范围内的高温瞬态热特性数据。基于辐射与导热耦合传热模型和群体智能优化的遗传算法,建立随温度变化等效导热系数的辨识模型。通过数值实验验证了辨识模型的可靠性。结合真实实验测量所得高温瞬态热特性数据,辨识获取材料在290~1 090 K温度范围内的等效导热系数,介于0.027~0.043 W/(m·K),随温度升高呈非线性上升趋势。An experimental apparatus was built to measure transient thermal characteristics of nanocomposite thermal insulation within a temperature range between 290 and 1 090 K. An inverse method was developed to retrieve the temperature-dependent effective thermal conductivity based on transient temperature measurements. It was achieved by combining a forward model for solving combined conduction and radiation and an optimization method based on genetic algorithm（GA）.The method was validated by numerical experiments. The temperature-dependent effective thermal conductivities of nanocomposite thermal insulation at normal pressure were retrieved by solving the inverse method. The retrieved value increased from 0. 027 to 0. 043 W/（m·K） as temperature increased from 290 to 1 090 K.

关 键 词：纳米复合隔热材料 等效导热系数 辨识 高温实验 

分 类 号：TK124[动力工程及工程热物理—工程热物理]