作　　者： ; ; ; ; ;

机构地区： 哈尔滨工业大学航天学院复合材料与结构研究所

出　　处： 《吉林大学学报（工学版）》 2006年第4期472-475,共4页

摘　　要： 介绍了一种在设计金属热防护系统中计算纤维隔热材料厚度的方法。采用能量方程和光学厚近似的方法对纤维隔热材料在再入过程中的热传递建立了传热模型,并对3种不同密度的纤维隔热材料进行了有效导热系数的测试。利用部分温度下的有效导热系数,采用遗传算法对纤维隔热材料的辐射衰减系数进行了优化。利用其余温度下的有效导热系数验证了优化后的传热模型的正确性。最后采用优化后的数值模型对再入过程进行了模拟,通过计算得出采用密度为96 kg/m3的纤维隔热材料的金属热防护系统总重量最轻。 A method that can calculate the thickness of fibrous thermal insulation in the metallic protection system was presented. A model for heat transfer of thermal insulation in metallic thermal protection system during spacecraft＇s reentry was established by combining optical thickness approximation method and energy partial differential equation. Three kinds of fibrous thermal insulation with different densities were tested for effective conductivity coefficient. Attenuation index of fibrous thermal insulations was optimized by genetic algorithm with a part of effective conductivity data and the other part of effective conductivity data were used to validate heat transfer model. In order to make spacecraft reentry safe, thicknesses of different density＇s fibrous thermal insulation were determined by simulation for reentry situation by the optimized model, and concluded that the fibrous thermal insulation with a density of 96 kg/m^3 used in the X-33 metallic thermal protection system is lightest.

关 键 词： 复合材料 传热 隔热材料 金属热防护系统 厚度 遗传算法 优化

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]