绝热材料炭化层孔隙结构及烧蚀气体状态分析  

Porous structure and ablating gas flow state of insulator carbon layer

作　　者：王书贤[1] 

机构地区：[1]西安航空学院航空工程系,陕西西安710077

出　　处：《兵器材料科学与工程》2015年第4期48-51,共4页Ordnance Material Science and Engineering

摘　　要：炭化层结构是绝热层烧蚀的重要影响因素,为进一步了解烧蚀过程中炭化层孔隙结构的特点,采用多孔介质体烧蚀模型进行数值模拟分析。用Arrhenius公式实时计算炭化层内沉积反应增加的碳量以及氧化反应消耗的碳量,获得了烧蚀过程中炭化层孔隙结构的演化规律。同时获得了炭化层内烧蚀气体的流速和压强的量级与分布情况,为进一步探索烧蚀过程中炭化层的机械剥蚀打下基础。Carbon layer porous structure is an important factor for insulator ablation rate. The numerical simulation was carried out to discuss the character of carbon layer porous structure during ablation process and porous media bulk ablation model was used. Arrhenius expression was taken to instantaneously calculate the increased carbon mass caused by deposition reaction and the decreased carbon mass caused by oxidation reaction. The evolvement pattern for carbon layer porous structure was obtained.The magnitude of speed and pressure of ablating gas in carbon layer was obtained also,and the results are the base for farther mechanical erosion research.

关 键 词：绝热材料 烧蚀 炭化层 孔隙结构 烧蚀气体 

分 类 号：V435.14[航空宇航科学与技术—航空宇航推进理论与工程]