基于动网格技术的碳碳三维喷管烧蚀仿真  

Ablation simulation of carbon/carbon three-dimensional nozzle based on dynamic mesh technique

作　　者：徐昌 孙志宏[1,2] XU Chang;SUN Zhihong(College of Mechanical Engineering,Ministry of Education,Donghua University,Shanghai 201620,China;Engineering Research Center of Advanced Textile Machinery,Ministry of Education,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学机械工程学院,上海201620 [2]东华大学纺织装备教育部工程研究中心,上海201620

出　　处：《东华大学学报（自然科学版）》2022年第6期92-96,共5页Journal of Donghua University(Natural Science)

基　　金：上海市轻质结构复合材料重点实验室开放课题基金(2232021A4-04)。

摘　　要：为准确预测固体火箭发动机的碳碳复合材料喷管的热化学烧蚀率,探究碳碳复合材料的物理属性对烧蚀率的影响。依据热化学烧蚀理论,建立三维喷管的动态流-固-热耦合数值模型;热化学烧蚀通过Fluent仿真软件壁面化学反应完成,利用动网格技术实现壁面退移。以70-lb BATES型固体火箭发动机的喷管为研究案例,研究推进剂配方、材料密度和热导率对碳碳复合材料喷管烧蚀的影响。结果表明:碳碳复合材料喷管的烧蚀率数值计算结果与试验测试值具有较好的一致性;烧蚀率在喷管喉部上游入口处达到峰值;烧蚀率随碳碳复合材料密度的增加而减小;壁面温度随碳碳复合材料热导率的增大而降低。A dynamic fluid-solid-thermal coupling numerical model of the three-dimensional nozzle was established based on the thermochemical ablation theory to predict the thermochemical ablation rate of the carbon/carbon composite nozzle of solid rocket motor and to explore the influence of the physical properties of the carbon/carbon composite on the ablation rate.The thermochemical ablation was accomplished by the wall chemical reaction in Fluent simulation software,and the wall recession was carried out by dynamic mesh technique.The nozzle of 70-1b BATES solid rocket motor was taken as research object,and the effects of propellant formula,material density and thermal conductivity on the ablation of carbon/carbon composite nozzle were discussed.The research results show that the numerical results of the ablation rate of the carbon/carbon composite nozzle are in good agreement with the experimental results.The ablation rate reaches the maximum at the upstream entrance of the throat.The ablation rate decreases with the increase of carbon/carbon composite density.The wall temperature decreases with the increase of thermal conductivity of carbon/carbon composite.

关 键 词：喷管 热化学烧蚀 碳碳复合材料 动网格技术 数值模拟 

分 类 号：TS101[轻工技术与工程—纺织工程]