Appl Opt. 2023 Jan 10;62(2):391-397. doi: 10.1364/AO.470738.
A turbulent flow field is created in a vehicle's head during high-speed flight, and this flow field causes the airborne optical system's receiving target images to be displaced, blurred, and jittered. In this study, we examine the impact of a 0°-15° angle of attack on the aero-optical imaging deviation. With the use of modeling and meshing software, we created a model of a conventional blunt-headed vehicle. Computational fluid dynamics calculations were performed using finite element analysis software; the ray equations were solved iteratively by the Runge-Kutta method. Finally, the imaging deviation data were obtained by using reverse ray tracing and tracing stop criteria. The findings demonstrate that, as the angle of attack increases from 0° to 15°, the thickness of the nonuniform flow field above the vehicle flow field cross-section axis gradually increases. As the density of the nonuniform flow field through which light propagates increases, so does the corresponding refractive index and the aero-optical imaging deviation.
在高速飞行中，车辆头部会产生湍流流场，该流场会导致机载光学系统接收的目标图像发生位移、模糊和抖动。本研究考察了攻角为 0°-15°时对气动光学成像偏差的影响。利用建模和网格划分软件，我们创建了一个传统钝头飞行器的模型。利用有限元分析软件进行计算流体动力学计算，通过龙格-库塔法迭代求解光线方程。最后，通过反向光线跟踪和跟踪停止准则获得成像偏差数据。研究结果表明，随着攻角从 0°增加到 15°，飞行器流场横截面上方非均匀流场的厚度逐渐增加。随着光传播的非均匀流场密度增加，相应的折射率和气动光学成像偏差也会增加。
