气相环境下EPDM绝热材料双区体烧蚀模型  

Bulk Ablation Model with Double Zones for EPDM in Gas Phase Environment

作　　者：王书贤[1] 李江[2] 蔡霞[1] 

机构地区：[1]西安航空学院,陕西西安710077 [2]西北工业大学燃烧流动和热结构国家级重点实验室,陕西西安710072

出　　处：《推进技术》2016年第2期378-385,共8页Journal of Propulsion Technology

基　　金：西安市科技计划项目(CXY1518(5))

摘　　要：针对气相环境下EPDM绝热材料的烧蚀行为建立了双区体烧蚀模型,着重考虑了沉积反应、气流剥蚀和膨胀现象.多孔介质区和固体区分开求解,采用交界面温度耦合的数值处理方法.对气相环境下的烧蚀实验开展了数值计算,分析了影响炭化层孔隙结构、质量烧蚀率的主要因素,计算结果与实验结果吻合较好.计算还获得了炭化层内烧蚀气体流速的量级是毫米到厘米,相对压强的量级是103~104Pa以及相对压强的分布情况.According to the ablation behavior of EPDM insulator in gas environment,a double zones bulk ablation model is established, taking deposition reaction, gas erosion and expansion phenomena into account. The porous medium zone and the solid zone are solved separately and interface temperature coupling numerical method is used. The numerical calculations for ablation experiments in gas phase environment are carried out , the main influence factors of the carbon layer pore structure and the mass ablation rate are analyzed. The computa-tional results agreed well with the experimental ones. The speed magnitude of ablating gas in carbon layer is about millimeter to centimeter pre second,the relative pressure magnitude is about 103~104Pa,and the relative pres-sure distribution in carbon layer is also obtained.

关 键 词：固体火箭发动机 烧蚀模型 沉积反应 气流剥蚀 膨胀 孔隙结构 烧蚀气体 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]