【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。更多还原

【Abstract】 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.更多还原