可压缩混合层光学传输效应理论分析与实验研究

摘要

Using dimensional analysis and experimental technique, the aero-optical effect at the second stage of a compressible mixing layer has been investigated. The theoretical analysis focuses on the relation between two-dimensional large-scale structure of a mixing layer and its corresponding aero-optical effects. Results show that the time-averaged bore-sight error (BSE) has nonlinear variability with the convective Mach number (M c). Moreover, we also present the relation among time-averaged BSE and turbulent kinetic energy, Reynolds shear stress at the interface between the mixing layer and free stream. Experimental results from a thin beam light passing through the compressible mixing layer verifly the theoretical result between time-averaged BSE and M c.%利用量级分析和风洞实验研究了可压缩混合层流动第二发展阶段气动光学效应的规律性。理论分析主要针对二维大尺度结构存在时视线误差(boresight error, BSE)与混合层流场及其特征参数之间的关系进行了讨论。研究结果表明：在混合层发展的第二阶段,时均BSE 与对流马赫数呈现出复杂的非线性关系；同时还发现流场中的湍动能和混合层界面处的雷诺应力分布也是影响时均BSE 的重要因素；采用细光束穿越混合层流场的风洞试验结果主要证实了时均BSE与对流马赫数之间的非线性关系。