OH和CH2O平面激光诱导荧光同时成像火焰结构

OH和CH₂O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CH₂O的分布则被用来显示火焰预热区的分布。利用OH和CH₂O 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CH₂O 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 PLIF imaging of flame structures

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.