摘要
分析了防热复合材料在高温烧蚀过程中所发生的物理 -化学变化 ;根据能量和质量守恒定律 ,建立了防热复合材料的体积烧蚀模型 ,并对某碳 /酚醛复合材料的烧蚀过程进行了数值模拟 .结果表明 ,材料的烧蚀不仅与温度而且与升温速率相关 ;升温速率越大 ,达到相同烧蚀温度时的烧蚀量越小 .烧蚀过程中温度的渗透速度减慢 ,温度梯度减小 .材料内部孔隙中气体的压力影响区域较温度的影响区域小 ,最大压力点随时间增加逐渐内移 ,最大压力相应增大 .
The physical and chemical changes in the processes of heat transformation and ablation of thermal protective composites in practice or in fabrication are addressed, and a volumetric ablation model is put forward for the calculation of ablation of composites at high temperature in accordance with the laws of mass and energy conservation. With the model, the rate of mass loss, instantaneous temperature field and gas pressure in pores of a carbon phenolic composite are numerically simulated and the results of simulation show that both penetration rate and gradient of temperature decrease when ablation happens. The pore pressure distributes in relative narrow range than temperature, its maximum increases with increasing time, and localizes deeper structure.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2001年第6期725-728,共4页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目 ( 10 10 2 0 0 5
19932 0 30 )
