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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。
A dual-zone body ablation model was established for the ablation behavior of EPDM insulation under gas-phase environment, with emphasis on sedimentation reaction, air erosion and expansion. Porous medium area and solid area are solved separately, and numerical method of interface temperature coupling is used. The numerical calculation of ablation experiment in gas phase was carried out. The main factors affecting the pore structure and quality ablation rate of carbonized layer were analyzed. The calculated results agree well with the experimental results. Calculations also show that the flow rates of the ablation gas in the carbonized layer are in the order of millimeters to centimeters and that of the relative pressure is in the range of 103 to 104 Pa and the relative pressure distribution.