航天器环境工程2026，Vol.43Issue(1)：65-74,10.DOI:10.12126/see.2025105
基于光谱特性的遮光剂复合氧化硅气凝胶传热模型及其热导率特性研究
Spectrally dependent heat transfer modeling and thermal conductivity of opacifier-doped silica aerogel composites
摘要
Abstract
Aerogel is a highly efficient thermal insulation material with significant potential for spacecraft thermal protection systems.However,at elevated temperatures,it exhibits high transparency to thermal radiation in the 3-8 μm wavelength band,resulting in enhanced radiative heat transfer.To suppress radiative heat transfer under high-temperature conditions,opacifiers are commonly incorporated into aerogel materials.In this study,a spectrally dependent coupled radiation-conduction numerical model was developed using the discrete ordinates method.The model was compared with the optically thick approximation model.The effects of SiC opacifier particle size and volume fraction on the effective thermal conductivity of silica aerogel composites were systematically investigated.The results showed that the optimal particle size was 2 μm over the temperature range from 300 K to 1400 K,with the minimum effective thermal conductivity of 0.03966 W/(m·K)achieved at 1100 K for a silica aerogel composite doped with SiC particles of 2 μm diameter at a volume fraction of 5%.This study provides theoretical insights and modeling support for the design and parameter optimization of opacifier-doped aerogel materials.关键词
气凝胶/遮光剂/光谱特性/辐射-导热耦合/离散坐标法/有效热导率Key words
aerogel/opacifier/spectral characteristics/radiation-conduction coupling/discrete ordinates method(DOM)/effective thermal conductivity分类
能源科技引用本文复制引用
匡志航,王飞,耿朝阳,朱克勇,黄勇..基于光谱特性的遮光剂复合氧化硅气凝胶传热模型及其热导率特性研究[J].航天器环境工程,2026,43(1):65-74,10.基金项目
国家自然科学基金项目(编号:52176051) （编号:52176051）
