Tian Xinming, Yang Jiabao, Gong Yan, Guo Qinghua, Wang Xingjun, Yu Guangsuo
Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai200237, P.R. China.
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, Ningxia750021, P.R. China.
ACS Omega. 2022 Oct 31;7(45):41137-41146. doi: 10.1021/acsomega.2c04689. eCollection 2022 Nov 15.
OH* and CH* chemiluminescence in hydrocarbon flames are often applied to characterize flame structure, equivalence ratio, strain rate, heat release rate, etc. In this study, chemiluminescence images of OH*, CH*, and CO* in the CH/O diffusion flame were obtained using a CCD camera imaging system. The effect of CO dilution on the flame structure, strain rate, and other flame characteristics of CH/O diffusion flame was discussed. The results show that CO dilution greatly affects flame morphology and chemiluminescence intensity. There are quantitative functions between the chemiluminescence peak intensity of OH* and CH* and the CO dilution level. The CO* average intensity in the flame zone is better suited to characterize the dilution level than the CO* peak intensity. Moreover, the strain rate of CO-diluted laminar flame is defined. It is found that there is a linear relationship between the thickness of the OH* reaction zone and the square root of the strain rate.
烃类火焰中的OH和CH化学发光常被用于表征火焰结构、当量比、应变率、热释放率等。在本研究中，使用CCD相机成像系统获得了CH/O扩散火焰中OH*、CH和CO的化学发光图像。讨论了CO稀释对CH/O扩散火焰的火焰结构、应变率和其他火焰特性的影响。结果表明，CO稀释对火焰形态和化学发光强度有很大影响。OH和CH的化学发光峰值强度与CO稀释水平之间存在定量函数关系。火焰区域内的CO平均强度比CO峰值强度更适合表征稀释水平。此外，定义了CO稀释层流火焰的应变率。发现OH*反应区的厚度与应变率的平方根之间存在线性关系。
