氧化铝纤维传热方式及反问题研究  

Heat Transfer Modes and Inverse Problem in Alumina Fibers

作　　者：褚福强[1] 吴晓敏[1] 朱毅[1] 于帆[2] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室、北京市CO2资源利用与减排技术重点实验室,北京100084 [2]北京科技大学机械工程学院,北京100083

出　　处：《工程热物理学报》2015年第8期1756-1759,共4页Journal of Engineering Thermophysics

摘　　要：本文分析了典型热防护绝热材料氧化铝纤维内部的传热方式及传热反问题。氧化铝纤维内部的传热主要以固体纤维导热、纤维孔隙气体导热和辐射传热为主。本文以气-固耦合导热模型和辐射模型为依据,利用数值方法求解了氧化铝纤维内部的温度场,并拟合得出耦合气体导热,固体导热和辐射三种方式的有效热导率。本文利用遗传算法求解氧化铝纤维的稳态传热反问题,根据氧化铝纤维的温度数据,优化得到有效热导率的预测值,并与参考值进行对比,结果表明在一定进化代数内优化误差随进化代数的增加而减小。Heat transfer modes and inverse problems were analyzed in alumina fibers in this paper.The three main heat transfer modes inside the fiber are solid fiber conduction,gas conduction and radiation.Numerical methods were used to get the temperature distribution inside alumina fibers based on the Gas-solid interactive conduction model and radiation model,and the effective thermal conductivity coupled with the three heat transfer modes is a cubic function of temperature by data fitting.A genetic algorithm was used to solve the inverse heat transfer problem at steady conditions.The predicted value of the effective thermal conductivity was optimized based on some temperature data as the evolution goes.The results show that the optimized error decreases with the increasing number of evolution generations within a certain range.

关 键 词：氧化铝纤维 传热方式 传热反问题 遗传算法 

分 类 号：TK123[动力工程及工程热物理—工程热物理]