Optimization design of built-up thermal protection system based on validation of corrugated core homogenization
Optimization design of built-up thermal protection system based on validation of corrugated core homogenization
复制标题
基于波纹芯均质化验证的组合式热防护系统优化设计
DOI：
10.1016/j.applthermaleng.2016.12.137
复制
发表时间：
2017
影响因子：
6.4
通讯作者：
Fang Daining
中科院分区：
文献类型：
--
作者：
Ma Yongbin;Xu Baosheng;Chen Mingji;He Rujie;Wen Weibin;Cheng Tianbao;Fang Daining
本文提出了一种组合式热防护系统的优化设计方法。组合式热保护系统包括经典的综合热保护系统（ITPS）和附加的隔热材料层，该隔热材料层附着在ITPS的冷表面上。本文将C/SiC复合材料制成的波纹夹芯板视为一种夹层结构，其芯部空隙填充有保温材料。本文发现，对于组合式热防护系统，基于波纹芯均匀化的温度计算结果与精确解存在较大偏差。验证了组合式热防护系统与传统热防护系统相比在隔热能力上的显著优势。研究还发现，随着绝热层绝热能力的提高，夹层板冷表面的温度趋于稳定。在此基础上，提出了一种高精度、高效率的组合式热防护系统的两步设计方法。在第一步中，利用有限元技术获得夹层板冷表面上的温度的稳定值，并将其用作第二步中所需的边界条件。在第二步，二维瞬态传热问题转化为一个一维问题的基础上，利用有限差分公式得到的多个绝缘层的最佳厚度。数值计算结果表明，考虑多层设计可以显著降低TPS的厚度和面密度。
An optimization procedure aiming to design a built-up thermal protection system is presented in this paper. The built-up thermal protection system comprises of classical Integrated Thermal Protection System (ITPS) and additional layer of insulation material which is attached to the cold surface of ITPS. In this paper, corrugated core sandwich panel which is fabricated using C/SiC composite material is considered as an ITPS when the core void is filled with insulation material. It is found in this paper that for the built-up TPS the temperature calculated based on corrugated core homogenization shows significant deviation from the exact solution. The significant advantage of the built-up TPS in insulation ability compared to the traditional ITPS is validated. An interesting phenomenon is also found that with the increasing insulation ability of the attached insulation, the temperature on the cold surface of the sandwich panel would converge to a stable value. Based on this finding, a two-step design procedure with high accuracy and high efficiency is exploited for the built-up thermal protection system. At the first step, the stable value of temperature on the cold surface of the sandwich panel is obtained utilizing the finite element technique, and is used as the boundary condition needed in the second step. At the second step, the two-dimensional transient heat transfer problem is transformed into a one-dimensional problem based on which the optimal thicknesses of the multiple insulation layers are obtained utilizing the finite difference formulation. Numerical results show that the thickness and the areal density of the built-up TPS can be significantly reduced by considering multilayer design.