不同高度对0°~15°攻角气动光学成像偏移的影响  

Influence of different altitudes on deviation of aero-optics imaging of 0°-15°angle of attack

作　　者：许亮[1] 王鹿洋 万自明[2] 赵世伟 周立业 王涛 Xu Liang;Wang Luyang;Wan Ziming;Zhao Shiwei;Zhou Liye;Wang Tao(Tianjin Key Laboratory of Complex Control Theory and Application,School of Electronic Engineering and Automation,Tianjin University of Technology,Tianjin 300384,China;Beijing Institute of General Electronics Engineering,Beijing 100039,China;School of Intelligent Engineering,Sun Yat-sen University,Shenzhen 518107,China)

机构地区：[1]天津理工大学电气工程与自动化学院、天津市复杂系统控制理论与应用重点实验室,天津300384 [2]北京电子工程总体研究所,北京100039 [3]中山大学智能工程学院,广东深圳518107

出　　处：《红外与激光工程》2023年第5期339-347,共9页Infrared and Laser Engineering

基　　金：国家自然科学基金(61975151,61308120)。

摘　　要：飞行器在高速飞行过程中,头部产生湍流流场,该流场使机载光学系统接收的目标图像发生偏移、模糊和抖动,这种气体流场对光学传播和光学成像的影响或作用称为气动光学效应。文中研究了典型钝头飞行器在不同高度对0°~15°攻角气动光学成像偏移的影响。使用软件对一种典型的钝头飞行器进行了建模和网格划分,基于计算流体力学使用Fluent作了大量的模拟计算,获得了飞行器不同工况下的周围的流场密度。通过密度和折射率的对应关系,得到了飞行器周围相应的折射率分布。使用反向光线追迹和停止准则,获得了成像偏移数据。结果表明:随着高度的增加,飞行器周围的大气密度减小。尽管不同高度的光线传播路径折射率分布图有着相同的变化趋势,但却有着不一样的变化程度。高度越大,光线传播路径上的折射率分布越平坦,成像偏移越小。从成像偏移斜率来看,随着高度的增加,成像偏移斜率越接近于0;随着攻角的增加,成像偏移斜率在往0的负方向增大。从成像偏移斜率的角度分析,低高度和大攻角都会引起较大的成像偏移值的变化。Objective Driven by military applications,the new generation of precision-guided weapons continues to develop toward improved guidance and strike accuracy.Imaging deviation is an important indicator of the aero-optics effect,which portrays the deflection effect of the aero-optics flow field on light propagation.The study of the imaging deviation of aero-optics can improve the guidance and strike accuracy of aircraft and provide support for the development of high-end military equipment in China,so it is necessary to conduct an in-depth study of its related problems.Methods A typical blunt-headed vehicle was modeled and meshed using software(Fig.2)and a large number of flow field calculations were made based on the computational fluid dynamics software Fluent to obtain the flow field density around the vehicle under different operating conditions(Fig.5).The corresponding refractive index distribution was obtained by the correspondence between density and refractive index.The light transmission equation was solved using the fourth-order Runge-Kutta method,and the imaging deviation data were obtained using the inverse ray tracing method and the stopping criterion.Results and Discussions The analysis of the refractive index distribution at different altitudes in the reverse light tracing(Fig.6)shows that the refractive index increases and then decreases along the propagation path as the light enters the aerodynamic optical flow field.The light tracing starts from the starting point inside the window,and the refractive index increases and then decreases against the direction of light incidence through the non-uniform flow field and finally reaches the free flow refractive index decreases until the end of the tracing.The refractive index of the non-uniform flow field near the optical window decreases with increasing altitude,and although the refractive index distribution of the light propagation path at different altitudes has the same trend,it has a different degree of change.As the altitude increases,the refractive i

关 键 词：气动光学 瞄视误差 攻角 成像偏移 

分 类 号：TJ765.1[兵器科学与技术—武器系统与运用工程]