Effects of Carbon Dioxide Addition on the Soot Particle Sizes in an Ethylene/Air Flame

Linghong Chen ； Jianwu Zhou ； Xianjue Zheng ； Jian Wu ； Xuecheng Wu ； Xiang Gao ； Gérard Gréhan ； Kefa Cen

《Aerosol and Air Quality Research》 17卷10期 (2017/10) Pp. 2522-2532

https://doi.org/10.4209/aaqr.2017.08.0271

摘要

Carbon dioxide (CO_2) is an important compound for the inhibition of combustion flame. This work investigated the effects of CO_2 addition on the soot particle sizes in axisymmetric laminar co-flow ethylene/air diffusion flames, as determined by using temporal laser-induced incandescence (LII). Additionally, the flame height and absorption function of soot particles were also studied. The results showed that the size and absorbency of soot particles decreases with the addition of CO_2. The total flame height also decreases with CO_2 addition, while the height of the dark region grows. These results show that CO_2 addition dilutes the gas stream, compresses the nucleation of soot particles and makes them less mature. This study provides useful information for the control of soot particle formation during combustion processes.

關鍵字

Carbon dioxide dilution ； Flame height ； Laser-induced incandescence ； Particle sizes ； Absorption function