OH* Chemiluminescence Characteristics and Structures of the Impinging Reaction Region in Opposed Impinging Diffusion Flames
OH* Chemiluminescence Characteristics and Structures of the Impinging Reaction Region in Opposed Impinging Diffusion Flames
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DOI：
10.1021/acs.energyfuels.5b02721
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发表时间：
2016-01
期刊：
影响因子：
5.3
通讯作者：
Xudong Song;Q. Guo;Chonghe Hu;Yan Gong;G. Yu
中科院分区：
文献类型：
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作者：
Xudong Song;Q. Guo;Chonghe Hu;Yan Gong;G. Yu
OH* 是火焰反应区生成的重要指标。根据高空间分辨率紫外成像技术和光纤技术获得的OH* 特征辐射，讨论了速度、喷嘴间距（L）和O/C当量比（[O/C]e）对火焰化学发光特性和相对碰撞区结构的影响。火焰冲击区域包括向上流、向下流和冲击核心区域。实验结果表明，撞击区的反应面积随速度的增加而增大，并趋于稳定。[O/C]e对撞击区上、下行流中OH* 的分布有影响。在富燃料条件下，在向下流中的反应面积变化很大，而在贫燃料条件下，在向上流和向下流中的反应面积是相同的。L与当量直径D的比值对裂纹扩展的影响最为复杂。
OH* is an important indicator of the generation of the flame reaction region. According to the OH* characteristic emissions obtained by high-spatial-resolution UV imaging and fiber optics, the effects of the velocity, the distance between the two nozzles (L), and the O/C equivalence ratio ([O/C]e) on the flame chemiluminescence characteristics and structures in opposed impinging regions are discussed herein. The flame impinging region includes an upward stream, a downward stream, and the impinging core region. The experimental results show that the reaction area in the impinging region increases until becoming steady as the velocity increases. [O/C]e can influence the OH* distributions in the upward and downward streams of the impinging region. Under fuel-rich conditions, the reaction area in the downward stream varies greatly, whereas the reaction areas in the upward and downward streams are the same under fuel-lean conditions. The ratio of L to the equivalent diameter D has the most complicated influenc...