可压缩混合层气动光学效应研究  

Aero-optical Effects in Compressible Mixing Layers

作　　者：史可天[1] 马汉东[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《计算物理》2010年第1期65-72,共8页Chinese Journal of Computational Physics

摘　　要：建立具有普适性的流场光学传输效应计算方法,针对脉动流场的光学传输计算方法可以预测空间非均匀分布的脉动流场引起的光学传输效应.以高阶紧致差分格式求解三维可压缩滤波N-S方程,对可压缩混合层流动进行空间模式的大涡数值模拟,得到流动失稳转捩直至完全湍流的空间发展全过程,采用时间模式的直接数值模拟进行对比验证.分析流动不同阶段对光学传输效应的影响,初步讨论流场特性与光学传输效应之间的联系,计算结果表明,在转捩区域流场引起的成像畸变最为严重.A method is established to calculate aero-optical effects. It is valid for nonuniform flow fields. A three-dimensional spatially developing mixing layer is simulated by large eddy simulation（LES）. Favre-filtered Navier-Stocks equation is discretized with a high order compact difference scheme. Transition from laminar to turbulence is simulated successfully. And it is compared with that of direct numerical simulation. Aero-optical effects caused by mixing layer is calculated to study relation between flow field and imaging distortion. It shows that imaging distortion is the severest at transition region.

关 键 词：气动光学效应 可压缩混合层 成像畸变 

分 类 号：O439[机械工程—光学工程]