材料防热的多尺度现象与防热建模

新型高速飞行器返回再入及在大气层内飞行的过程中面临多样化的气动加热环境,材料工艺的改进和多组分的添加使材料高温热响应特性变得更加复杂,并呈现多尺度特性.文章从飞行热环境、材料工艺特征和细微观响应等方面对材料防热机理和建模方法进行了阐述,对不同类型飞行器热环境特征与防热建模难点进行了分析,对各类防热材料工艺与热响应特点进...

Multi-Scale Phenomena in Thermal Protection Materials Experienced Aero-Heating and Thermo-Ablative Modeling Forward Quantitative Analysis

With the development of modern hypersonic vehicles, the aero-heating environment generated from their high-speed atmosphere re-entry or long time near-space flight becomes diversified and complicated. The aero-heating distribution and evolution of vehicles generally have time and space multi-scale characteristics. This paper reviewed the progress in fields of mechanism and thermo-ablative modeling research of thermal protection materials, whose thermal environments, processing and micro-scale response were especially concerned. Aero-heating characteristic and the difficulty of thermo-ablative modeling for various vehicles were analysed. The characteristic of material and its the rmal response were summarized. The key issues need to focus of thermo-ablative modeling and analysis, and the typical application were proposed. Furthermore, some typical examples were demonstrated to introduce the computational methodology, optimized designs and experimental verifications of materials' high temperature physical-chemical properties. This study will be benefit to thermal protection designs of hypersonic vehicles, especially for future multi-functional ones.