高速飞行器热流固耦合光传输分析

摘要

气动环境下，光学头罩与来流之间的热流固耦合作用形成的非均匀折射率场将严重干扰光线传输。针对这一问题，首先通过求解Navier－Stoker方程，得到流场各项参数的分布，并对光学头罩进行热流固耦合分析。然后采用光线追迹法模拟光线从目标到达探测器面的传输路径，计算光程差。最后通过像质评价函数分析其对成像质量的影响。结果表明：随着飞行速度增大，耦合折射率场对光传输的影响增大，光学系统成像质量严重下降。%In the aerodynamic environment, the inhomogeneous refractive index field formed by the effect of thermal-fluid-solid coupling between optical dome and flow field will seriously interfer the optical transmission.Firstly, the parameters distribution of flow field is obtained by solving Navier-Stokes equa-tions, and the thermal-fluid-solid coupling analysis for optical dome is done.Then, the optical transmis-sion path from the target to the detector is simulated by light tracing method, and the optical path differ-ence (OPD) is calculated.Lastly, the effect on image quality is analyzed by image quality evaluation functions.The result shows that the effect of refractive index field on optical transmission increases and the image quality of optical system declines seriously with the increase of speed.