再入体碳基防热材料烧蚀流场红外辐射模拟  

Simulation of flow field infrared radiation over reentry vehicle with ablation of carbon-based thermal protection material

作　　者：高铁锁[1] 江涛[1] 丁明松[1] 刘庆宗 傅杨奥骁 许勇[1] 李鹏[1] 董维中[1] Gao Tiesuo;Jiang Tao;Ding Mingsong;Liu Qingzong;Fuyang Aoxiao;Xu Yong;Li Peng;Dong Weizhong(Computational Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]中国空气动力研究与发展中心计算空气动力研究所,四川绵阳621000

出　　处：《红外与激光工程》2023年第5期223-233,共11页Infrared and Laser Engineering

摘　　要：烧蚀效应是高超声速飞行器目标特性分析评估中的重要问题之一。基于高温反应气体动力学方程与辐射输运方程,建立了飞行器表面防热材料热化学烧蚀流场及其红外辐射特性的计算模型和方法。以钝锥体弹头外形及其表面防热材料碳-碳为对象,研究了材料烧蚀效应对再入目标流场红外辐射特性的影响,分析了再入体烧蚀流场及尾流在不同波段红外辐射的分布特征和变化规律。研究发现:典型状态计算结果与试验测量及文献预测结果一致,表明烧蚀流场及红外辐射模型和方法的可行性;材料热化学烧蚀现象对再入流场红外辐射特性产生严重影响,使3~8μm波段尾流积分辐射强度增加一个量级以上,并随着尾流长度增加而增大;烧蚀流场红外辐射主要来自CO、NO和CO_(2)等化学组分,烧蚀对1~3μm波段流场红外辐射影响相对较弱;再入速度不变情况下,烧蚀流场在3~8μm波段红外辐射强度随再入高度降低而增强;再入高度不变情况下,烧蚀流场在同样波段红外辐射强度随着再入速度减小而减弱。Objective Hypersonic vehicle travels at a very high speed in atmosphere.Due to the high flight velocity,hypersonic vehicle has to endure very high heating rates on surface,ablative material is widely used in the design of thermal protection system(TPS).During the ablation process,gaseous ablator species are injected into the flow field,these gaseous species can involve inflow air in the chemical reaction,which changes flow field species distribution and temperature distribution,thus changing the target infrared radiation characteristics of hypersonic vehicle.Infrared radiation characteristics are the foundation of aircraft detection,identification and interception.Therefore,it is necessary to study the effect of thermal protection material ablation on aircraft target infrared radiation characteristics.For this purpose,this paper focuses on strategic warhead blunt body configuration with carbon-based thermal protection material.Numerical simulation of flow field and its infrared radiation is conducted,ablation effects on infrared radiation of flow over reentry body are discussed.Methods Numerical simulation of flow field is conducted by solving three-dimensional thermal-chemical nonequilibrium Navier-Stokes equations.To simulate the surface ablation effect,surface velocity boundary condition,surface mass balance condition and surface energy balance condition are introduced into the computation process of flow field simulation.Oxidation,catalytic reaction and sublimation reaction of surface ablation material are also taken into account.To simulate the chemical reactions in the flow field,chemical reactions model of high temperature air with gaseous ablator species is used.Based on spectral band radiation model and by solving high temperature gas radiation transport equation,numerical simulation of flow field infrared radiation is conducted,the radiation mechanism of NO,CO,CO_(2),CN,N_(2),O,N is considered.Results and discussion Numerical simulation results at typical condition agree well with experiments and numeri

关 键 词：高超声速再入 防热材料 烧蚀效应 高温气体流场 红外辐射 

分 类 号：V211.751[航空宇航科学与技术—航空宇航推进理论与工程]