摘要
研究复合材料温度场的变化规律是烧蚀热防护系统的重要内容。为了揭示在不同烧蚀率下炭/炭复合材料的热响应,采用虚拟失效、剔除单元的方法对烧蚀表面退缩条件下瞬态温度场的变化规律进行了数值分析和研究。建立了移动边界条件下烧蚀温度场计算的有限元数值计算模型。数值分析结果表明,烧蚀材料的壁面温度与材料的烧蚀率密切相关,壁面温度随着烧蚀率的增大而减小,材料的烧蚀有效的起到了热防护效果。数值仿真结果满足研究项目要求,提出的方法对任意的烧蚀热防护材料均具有适应性。
The change rule of temperature field of composite material under different ablation conditions is an im- portant research content in the thermal protection system. In order to reveal the thermal response of carbon - carbon composites at different ablation rates, the change rule of temperature field under ablation surface receding condition was numerically analysed and researched by the method of virtual failure and deleting cells. The finite element nu- merical calculation model of ablation temperature field was established under moving boundary conditions. The result of numerical analysis shows that the wall temperature of the ablative materials closely relates to the material ablation rate, and the wall temperature decreases with the increase of the ablation rate, and the ablation of materials has played an effective thermal protective effect. The results of numerical simulation meet the requirements of the re- search program. The research method is aolalicable for any ablative thermal orotection materials.
出处
《计算机仿真》
CSCD
北大核心
2013年第4期411-415,共5页
Computer Simulation
基金
国家自然科学基金(50271016
50571042)
关键词
炭
炭复合材料
烧蚀性能
移动边界
烧蚀率
有限元仿真
Carbon - carbon composites
Ablation properties
Moving boundary
Ablation rate
FEM simulation
