亚声速球/柱流场对激光传输影响的数值模拟  

Numerical Simulation of Aero-Optical Effects of a Laser Beam Propagating Through a Subsonic Hemispherical/Cylindrical Flow Field

作　　者：关奇[1] 陈志华[1] 杜太焦[1] 闫伟[1] 彭国良[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2015年第1期32-36,共5页Modern Applied Physics

摘　　要：采用大涡模拟的方法计算了来流速度为0.6 Ma的球/柱体附近的流场,并采用相屏法研究了该流场对激光传输的影响。结果表明:球头附近的流场引起的气动光学效应对传输到远场的激光光斑特性有较大影响,影响程度随激光传输方向而变化,并且激光发射孔径越大、激光波长越短,影响程度越大。The aero-optical effects of a laser beam propagating through the flow field of a hemispherical/cylindrical structure at a velocity of 0.6 Ma were investigated using the large eddy simulation method combined with the phase screen method,and the laser characteristics in far field were examined under various conditions.The results show that the aero-optical effects at the head of the hemispherical/cylindrical structure strongly affect the far-field laser characteristics,and the scale of the effect differs for different elevation angles.For larger aperture and shorter laser wavelength,the effects become more serious.

关 键 词：激光传输 气动光学效应 大涡模拟 

分 类 号：TN012[电子电信—物理电子学] O43[机械工程—光学工程]