Abstract To improve the thermal protection performance of the charring composites in reentry vehicles subjected to the challenged aerothemodynamic environment, we design six kinds of charring ablators based on the pore structure control. At the same time, a thermal-fluid-chemical coupled ablation model is developed for evaluating the designed ablators’ performances. Based on this model, the coupled thermal-fluid-chemical responses of an existing composite with homogeneous pores’ distribution are calculated to validate the developed model. After that, the numerical results of the pore structure controlled charring composites indicate that a charring ablator with a reasonable pores’ distribution will have better thermal protection performance, especially in which the initial pores’ content rise at the locations near the ablator’s bondline and in the middle of the thickness. This study will be a guidance for the design of charring composites for thermal protection application in reentry vehicles in a quantitative and efficient manner.

中文翻译：

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基于孔结构控制的炭化复合材料新设计及其热防护性能评价

摘要 为了提高再入飞行器中炭化复合材料在空气动力学环境挑战中的热防护性能，我们设计了六种基于孔隙结构控制的炭化烧蚀剂。同时，开发了一种热-流体-化学耦合烧蚀模型，用于评估设计的烧蚀器的性能。基于该模型，计算具有均匀孔隙分布的现有复合材料的热-流体-化学耦合响应，以验证所开发的模型。之后，孔结构控制炭化复合材料的数值结果表明，具有合理孔分布的炭化烧蚀剂将具有更好的热防护性能，特别是其中初始孔隙含量在烧蚀器粘合线附近和厚度中间的位置上升。这项研究将为设计用于再入飞行器热保护应用的炭化复合材料以定量和有效的方式提供指导。