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从高超声速湍流流场中的多尺度涡结构入手,基于随机透镜理论,利用经典的Mie散射理论对不同尺度涡结构产生的气动光传输效应进行了分析,得到涡结构的散射特性与其尺度的相关性;再结合由不同马赫数下的CFD流场数据得到的Strehl比以及不同雷诺数条件下的风洞测试试验序列图像中退化图像能量集中度的统计结果,分析高超声速湍流流场中小尺度涡结构的分布规律及其演化过程;建立气动光学畸变与小尺度涡结构的关系。结果表明,利用Mie散射理论可以直观分析高超声速湍流流场中不同尺度涡结构的分布情况和由此带来的光学畸变。
From the multi-scale vortex structure in the hypersonic turbulent flow field, based on the random lens theory, the classical Mie scattering theory is used to analyze the aerodynamic light transmission effect of vortex structures with different scales. The correlation between the scattering characteristics of the vortex structure and its scale Based on the statistical results of the Strehl ratio obtained from the CFD flow field data at different Mach numbers and the energy concentration of degraded images in the wind tunnel test under different Reynolds numbers, the effects of small-scale vorticity in the hypersonic turbulent flow field The distribution of structure and its evolution process; the establishment of aerodynamic optical distortion and the relationship between small-scale vortex structure. The results show that using the Mie scattering theory, the distribution of vortex structures at different scales in the hypersonic turbulent flow field can be directly analyzed and the optical distortion caused by them can be directly analyzed.