金属热防护系统隔热材料的热传导模型研究
首发时间:2009-07-10
摘要:金属热防护系统是下一代可重复使用航天器较为理想的热防护系统,而隔热材料是金属热防护系统的主要隔热部件。陶瓷纤维隔热毡是金属热防护系统理想的隔热材料,所以陶瓷纤维隔热毡的设计关系到热防护系统的厚度和重量。为了更好的描述陶瓷纤维隔热毡的导热过程,陶瓷纤维隔热毡的热传导和热辐射被分开计算,因此选择合适的隔热材料热传导模型是金属热防护系统设计的重要前提。陶瓷纤维隔热毡常见的热传导模型为并联模型、串联模型、并串联模型。本文利用稳态传热试验测得的陶瓷纤维隔热毡表观导热系数,使用遗传算法对陶瓷纤维隔热毡的表观导热系数表达式进行优化,优化结果发现,当热传导模型采用并联模型时,优化后陶瓷纤维隔热毡的表观导热系数计算值和测量值的平均相对误差最小,为3.92%。所以,并联模型是陶瓷纤维隔热毡热传导模型中最接近于实际情况的模型。
关键词: 金属热防护系统 陶瓷纤维隔热毡 热传导模型 遗传算法
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Research on thermal conduction models of insulating material of metallic thermal protection system (MTPS)
Abstract:Metallic thermal protection system (MTPS) is an ideal system for thermal protection of reusable launch vehicle in future, and insulating materials are main element of MTPS. Ceramic fibrous thermal insulation (CFTI) is the ideal insulating material for MTPS, so the design of ceramic fibrous thermal insulation will affect the weight and thickness of MTPS. The thermal conduction and thermal radiation are divided to make better description of thermal mechanism of CFTI, thus an appropriate thermal conduction model of CFTI is the important premise for designing MTPS. The common thermal conduction models are parallel model, series model and parallel-series model. By means of experiments data and genetic algorithm, this thesis finds out that by using the parallel thermal conduction model, the average relative error between counted apparent thermal conductivity and experiments data is the smallest, as small as 3.92 percent. So the parallel thermal conduction model is the best model to describe thermal conduction mechanism of CFTI.
Keywords: metallic thermal protection system (MTPS) ceramic fibrous thermal insulation(CFTI) thermal conduction model genetic algorithm
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