压缩湍流剪切层-空腔流体气动光学效应的计算机仿真(英文)  

Computational Simulation on Aero-optic Effects of Compressible Turbulent Shear-layer Cavity Flow*

作　　者：殷柯欣[1] 姜会林[1] 佟首峰[1] 

机构地区：[1]长春理工大学光电工程学院,长春130022

出　　处：《光子学报》2008年第4期780-784,共5页Acta Photonica Sinica

基　　金：the National High Technology Research and Development Programof China (2003AA712014)

摘　　要：对亚音速机载光电系统由于剪切层-腔流体而导致的气动光学效应进行了数值模拟.剪切层内的压缩效应用对流马赫数0.8表示,腔体的几何形状为L/H=6.7,平均腔内温度为230K.应用商用CFD软件对这个非稳定二维流体进行了仿真.结果表明Strehl比随着波长的增加而增大,但是模糊角却变得相对复杂.证明了波长效应并给出了优化的波长模型λ*=2πσt.The evaluations of aero-optic effects for subsonic airborne electro-optical （EO） system from shear-layer cavity flow are presented. Compressibility effects in the shear layer are measured by convective Mach number 0. 8, the geometry of cavity is L/H ： 6. 7 and the average cavity temperature is T = 230 K. Numerical simulation of this unsteady two-dimensional flow using the commercially available software CFD code has also been carried out and it proves that Strehl ratio improves with wavelength increasing; however, the dispersion angle is complex. The wavelength effect on the system performance is also theoretically validated and then an optimum wavelength model λ＊ ： 2πσ, is given.

关 键 词：气动光学效应 剪切层腔流体 光学像差 密度波动 波前偏差 

分 类 号：TN929.12[电子电信—通信与信息系统]