超音速光學(xué)頭罩氣動光學(xué)效應(yīng)仿真分析
[Abstract]:During the high speed flight, due to the flight speed of Mach 5, the surrounding air will have serious friction with the optical hood, which will cause the temperature of the outer surface of the optical window to rise, resulting in shock layer and boundary layer, etc. There is an irregular gradient refractive index field between the target and the optical imaging equipment, that is, the aero-optical effect is produced. The effect of aero-optics will lead to the optical path difference in the imaging of the system, which will lead to wave aberration, offset, jitter, blur, and the optical imaging system in the seeker will receive the affected target image and reduce the ability of target recognition and tracking. Therefore, the study of aerodynamic optical effect of hypersonic vehicle is of great significance in guidance. In this paper, the research history of atmospheric aero-optical effects is first analyzed, especially the achievements and development trends of aero-optical effects in recent years are analyzed in detail. The main content of this paper is the fluid distribution and its influence on the imaging of supersonic aircraft with a speed of 5 Mach when it flies smoothly under different flight conditions. Secondly, through the research of fluid mechanics, the two-dimensional mesh model of aircraft is established by using the grid modeling software. A non-uniform distributed model grid is used to sample and partition the grid flow field around the aircraft. Using the finite element analysis software of dynamic fluid dynamics, the flight parameters, such as flight angle of attack and variables of different environmental parameters, are set, boundary conditions, solver, solving methods and solving equations are determined. The aero-optical effects of the boundary layer and shock wave are studied, and the influence of different parameters on the flow field around the aircraft is obtained by adjusting the flight angle of attack and the flight environment parameter variables. Thirdly, this paper studies and analyzes the propagation mode of light in the flow field. Combining the ray tracing method and physical optics method, a fixed step ray tracing method is used by studying the traditional ray tracing method. It can simplify the modeling difficulty without affecting the calculation accuracy. Finally, the results are analyzed, and the simulation results are compared with the theory, and the results are explained theoretically. In summary, the main content of this paper is to generate the discrete distribution of air density in the area around the optical window by Fluent. The discrete distribution of refractive index is established by using the data read from MATLAB, and the incident light of point source in infinite distance is simulated. The wavefront aberration distribution on the optical window surface is obtained by the ray tracing method with fixed step size, and the complex amplitude distribution of the phase surface is obtained by Fourier transform, and the image quality evaluation function is analyzed and the conclusion is obtained.
【學(xué)位授予單位】:北京理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:V211
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