含相变材料热防护结构一体化设计与试验

利用相变材料储热密度大、比热容高等优势，设计了一种含相变材料的新型一体化热防护结构(PCM-ITPS)，并通过数值计算分析了其隔热特性。结果表明，在一体化热防护结构底板处铺设相变材料可吸收热短路效应导入的过量热载，改善结构的隔热性能。然后设计并制备PCM-ITPS试验件，通过隔热性能测试试验对结构隔热特性进行验证。在此基础上进行热应力分析验证其承载性能，并以结构参数为设计变量，隔热和承载性能要求为约束条件，实现了PCM-ITPS结构的轻量化设计，优化后PCM-ITPS方案相对传统ITPS方案减重23.35%。以上工作为促进热防护系统的设计-制造一体化进程提供必要的理论储备与技术支持。

Design and Experimental Investigation of Integrated Thermal Protection Structure Containing Phase Change Material Layer

 This paper designs a new type of ITPS containing phase change material layer (PCM-ITPS). The numerical simulation is conducted to discuss the impact of the PCM on the thermal protection performance, and the PCM-ITPS unit cell test samples are manufactured to test the thermal protection performance. Both numerical simulation and test results prove the excellent thermal protection performance of the PCM-ITPS. On this basis, the thermal stress finite element simulation of the model is completed to verify its mechanical performance. Furthermore, the platform for the automatic design and optimization is built for the PCM-ITPS. With the structural dimensional parameters as the design parameters and the performance requirements as the constraints, the lightweight design of the integrated thermal structure is accomplished. As a result, the mass of the optimized PCM-ITPS is reduced by 23.35% compared with the optimized traditional ITPS. In conclusion, this work is able to provide the theoretical and technical support for the integrated design and manufacturing processes of a thermal protection system.