OH和CH_2O平面激光诱导荧光同时成像火焰结构  

Simultaneous OH and CH_2O PLIF imaging of flame structures

作　　者：朱家健[1] 赵国焱[1] 龙铁汉 孙明波[1] 李庆[1] 梁剑寒[1] 

机构地区：[1]国防科学技术大学高超声速冲压发动机技术重点实验室,长沙410073

出　　处：《实验流体力学》2016年第5期55-60,87,共7页Journal of Experiments in Fluid Mechanics

摘　　要：OH和CH_2O平面激光诱导荧光(PLIF)同时成像技术在研究火焰结构和燃烧反应中间产物二维分布等方面能够发挥重要作用。OH的分布被用来表征火焰反应区的结构,而CH_2O的分布则被用来显示火焰预热区的分布。利用OH和CH_2O PLIF同时成像技术研究了甲烷/空气部分预混火焰的结构。从实验系统、光路调节、时序同步、OH A-X(1,0)扫谱、数据采集和处理等方面讨论了PLIF同时成像技术的实验方法。实验结果表明,OH和CH_2O PLIF同时成像能够分别呈现甲烷/空气部分预混火焰反应区和预热区不同形状的瞬时结构;由于反应区在相邻位置的结合,在火焰中能够局部生成新的分裂的预热区。Simultaneous OH and CH2O Planar Laser-Induced Fluorescence （PLIF） imaging plays an important role in studying flame structures and two-dimensional distribution of intermediate species in combustion. The OH distribution is used to represent the reaction zone structure of flames, whereas CH2O is employed to show the pre-heating zone structure of flames. Flame structures of a CH4/air partially premixed flame were investigated using simultaneous OH and CH2O planar laser-induced fluorescence （PLIF） imaging. Experimental methods, including experimental system, optic alignment, synchronization scheme, excitation scan of OH A-X（1, 0）, data collection and analysis, are discussed. Experimental results suggest that simultaneous OH and CH2O PLIF imaging can show different instantaneous structures of reaction zones and preheating zones in the CH4/air partially premixed flame. New separated preheating zones are locally generated due to the merge of the reaction zone between two adjacent areas.

关 键 词：平面激光诱导荧光 激光诱导荧光 激光燃烧诊断 火焰反应区 火焰预热区 

分 类 号：O643.2[理学—物理化学]