典型C/CSi盖板隔热结构优化分析

Optimization of C/CSi shingle thermal protection system under reentry aerodynamic heating conditions

针对典型环境条件下C/CSi盖板隔热结构进行瞬态有限元传热分析,模拟隔热结构内部的辐射和传导复合传热,建立相应质量分析模型。通过对双层纤维隔热结构进行传热分析,得到隔热层体积比变化对隔热性能的影响规律。针对双层纤维C/CSi盖板隔热结构,以各层纤维材料体积比和厚度值为变量,实现底层结构温度和隔热结构质量的优化。分析发现当质量和隔热层厚度一定时,小体积比薄外层隔热纤维与大体积比厚内层隔热纤维匹配能达到较好隔热效果;而在温度限制条件下,各层纤维体积比相对一致时结构总体质量最轻。

Thermal and mass analyses of C/CSi shingle thermal protection system （TPS） were done to simulate aerodynamic heating conditions by the finite element method. And the regulation between volume fraction and performance of thermal protection system was also researched. For a C/CSi shingle TPS with two layers insulations, the volume fraction and thickness of the two layers were optimized numerically for maximum structure temperature and minimum TPS weight. It was shown that thinner low volume fraction outer layer and thicker high volume fraction inner layer would bring a better performance under total thickness and mass constraints, but for temperature constraint the optimum of thickness and mass needed relevant uniform solidities.