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.
出处
《光子学报》
EI
CAS
CSCD
北大核心
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)
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
Aero optic effects
Shear layer cavity flow
Optical-aberration
Density fluctuation
Wave-front deviation
