Novel ablation model of silica-reinforced composites considering C-SiO2 reaction

被引：0

作者：

Wang X. ^{[1
]}

Nian Y. ^{[1
]}

Liu N. ^{[2
]}

Cheng W. ^{[1
]}

机构：

[1] Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei

[2] Hypersonic Vehicle Research Center of Thermal Protection and Insulation, Beijing Institute of Space Long March Vehicle, Beijing

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 06期

关键词：

Ablation; Chemical reaction; Composites; Gas component concentrations; Numerical simulation; Resin content;

D O I：

10.11949/0438-1157.20201433

中图分类号：

学科分类号：

摘要：

Silica-reinforced composites are important ablative thermal protection materials. In this paper, a new ablative analysis model of silica-reinforced composites was established based on the comprehensive considerations of a variety of physical and chemical reactions such as carbon-silicon dioxide reaction, carbon oxidation, erosion and evaporation of molten silicon dioxide. First, the concentration equations of gas species in the near wall area considering C-SiO2 reaction were derived by using the mass conservation principle, chemical equilibrium law and saturated vapor pressure equation, and then based on the solution of equations under different temperature and pressure, the ratio of carbon reacting with silicon dioxide to total carbon consumption were calculated. Then the mass and energy conservation equations considering C-SiO2 reaction were established. The model was used to calculate the ablation velocity of the material under different working conditions. The results showed that the simulation met the experimental data well, and the maximum absolute error of the ablation velocity was only 0.034 mm/s. Finally, the effect of resin content on the ablative properties of silica-reinforced composites was studied, and the results showed that the ablation performance was best when the resin content was about 0.5. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：3270 / 3277

页数：7