攻角对临近空间飞行器侧喷射流红外辐射特性影响数值模拟  

umerical simulation of infrared radiation characteristics of nearspace aircraft side jet due to angle of attack

作　　者：吕蓉 牛青林 王晓冰 Lv Rong;Niu Qinglin;Wang Xiaobing(School of Mechanical and Electrical Engineering,North University of China,Taiyuan 030051,China;National Key Laboratory of Scattering and Radiation,Shanghai 200438,China)

机构地区：[1]中北大学机电工程学院,山西太原030051 [2]散射辐射全国重点实验室,上海200438

出　　处：《红外与激光工程》2024年第1期83-93,共11页Infrared and Laser Engineering

基　　金：国家自然科学基金项目(52006203,U22B2045);山西省归国留学人员科研资助项目(2021-113);航空科学基金项目(2019290U0003)。

摘　　要：临近空间飞行器侧喷射流干扰效应对目标红外辐射特性规律影响受到广泛关注。文中以典型锥柱裙飞行器为研究对象,预测飞行器典型飞行工况(20 km@5 Ma)不同攻角下的绕流场、侧喷流和壁面温度,结合窄谱带模型处理高温气体辐射物性参数,采用视在光线法求解辐射传输方程,分析攻角对侧喷流的复燃及目标在不同谱带和不同观测角度下红外辐射特性的影响。结果表明:随着攻角由负转正射流复燃程度降低,α=10°较α=-10°偏低176%;侧喷流在2.7μm和4.3μm两个特征峰值波段辐射显著,其他波段内目标辐射主要来源于本体;目标辐射强度在俯视观测角度下随攻角由负转正而减小,在侧视观测角度下攻角出现引起辐射强度降低,α=±10°较α=0°偏低6.8%。该研究可为临近空间飞行器侧喷射流相关的目标特性识别提供理论参考。Objective Divert and attitude control system's side jet flow is ejected along the normal direction of the projectile during operation,which will form a series of complex structural flow fields called jet interference effects.The high-temperature jet not only generates infrared radiation but also affects the temperature distribution on the surface of the projectile,which ultimately affects the radiation characteristics of the target.In particular,the DACS operation is often accompanied by a change in the angle of attack.The change in the angle of attack causes a significant change in the jet interference effect,which can cause significant changes in the infrared radiation characteristics of the target.In the field of attack-defense mutual countermeasures,both for the stealth and surprise defense of interceptors and for the evasion and identification of interceptors,the urgent concern for the infrared radiation characteristics of targets under high-speed jets is raised.The paper analyzes the effects of the angle of attack on the reignition of the thermal jet field at typical altitudes,and the effects of the angle of attack on the infrared radiation characteristics of the projectile in different spectral bands and at different observation angles.Methods With the typical cone-cylinder-flare elastomer as the research object(Fig.1),the three-dimensional NS equation with chemical reaction source terms is solved.The reaction thermal jet field and the wall temperature of the projectile are calculated in conjunction with the radiative equilibrium wall.The radiative transfer equations are solved based on the statistical narrow band model and the apparent light method from the high temperature database.A Cartesian coordinate system is used to describe the radiation distribution at all possible angles,and the observed angles are represented by the zenith angleθand the circumferential angleφ(Fig.3).Results and Discussions Compared to α=0°,the Mach disk increases at α=10°,the jet expands upward and the high-temperature ar

关 键 词：临近空间飞行器 侧喷射流 喷流干扰效应 红外辐射 攻角 

分 类 号：TN219[电子电信—物理电子学]