高速湍流流场气动光学传输效应研究

Aero-optical transmission effects through the high-speed turbulent flow field

高速飞行器在大气层中高速飞行时,其头罩表面受大气气流的影响产生严重的气动光学效应。头罩周围湍流流场的高频变化,将影响来自目标的红外辐射光线的传输,使导引头成像器中目标图像产生模糊、抖动、偏移和能量衰减,给红外成像末制导带来不利影响,降低导引头对目标的探测、跟踪与识别能力,进而影响末制导精度。以红外成像制导技术在高速拦截器上的应用需求为背景,进行了高速湍流流场光学传输效应理论计算基本方法的分析,介绍了建立的数学模型和仿真软件,最后给出了典型状态下的计算结果。

The aerodynamic flow about an aircraft or other vehicles in flight has a marked influence on the performance of the onboard optical sensor system. Missile interceptor seeker windows undergo significant heating and stress during supersonic flight. These effects lead to window and flow field distortions that can significantly degrade the image quality on the seeker. A method is developed to predict the optical transmission of the turbulence flow field. The approach and some computer simulation results are presented.