二氧化硅气凝胶隔热复合材料的性能及其瞬态传热模拟

Performance and Heat Transfer Simulation of Silica Aerogel Composites

高马赫数、新型航天飞行器承载严重的气动加热环境,其隔热材料的性能与传热计算对飞行器热防护结构的优化和预测具有一定的指导意义。研究了二氧化硅气凝胶隔热复合材料的结构与性能,并进行了瞬态传热模拟。结果表明复合材料热导率仅为0.018W/m.K,瞬态传热模拟结果与考核测试值吻合,为预测和优化隔热材料提供了一定的依据。

With the development of high-speed spacecrafts, the properties and heat transfer simulation of thermal protection materials used by the spacecrafts are of great significance. This study aims to study the properties of silica aerogel composites and heat transfer simulation.The results indicate that thermal conductivity of the silica aerogel composites is only 0.018W/m·K and transient heat transfer simulation shows good agreement with the experimental data. Thus the simulation method can forecast the experimental conclusions and optimize the geometric structure of the composites.