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本征正交分解在气动光学畸变仿真中的分析与应用

Keywords: 气动光学,相干结构,奇异值分解,本征正交分解,光学畸变,仿真,分析,应用,SIMULATING,ANALYSIS,构造,湍流,验证,相对误差,特性,畸变波前,描述,利用,简易算法,吻合性,光程差,畸变参数,气动光学

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Abstract:

通过本征正交分解研究湍流流场相干结构和所造成的气动光学畸变间的关系.以高速导弹红外窗口绕流流场的计算流体力学结果为源数据,通过奇异值分解实现流场折射率场的本征正交分解.比较折射率场的低阶奇异值和源数据产生的气动光学畸变参数光程差,二者有很好的吻合性.由此提出一种采用折射率场的奇异值直接仿真光程差的简易算法.仿真表明只利用二维折射率场的第一阶奇异值即能描述畸变波前的特性,其光程差的相对误差不超过±2%,验证了湍流中的相干结构造成了大部分的气动光学畸变.

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