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

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

doi:10.4209/aaqr.2017.08.0271

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

Optical/Radiative Properties and Remote Sensing

Linghong Chen¹, Jianwu Zhou¹, Xianjue Zheng², Jian Wu¹, Xuecheng Wu ¹, Xiang Gao¹, Gérard Gréhan³, Kefa Cen¹

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¹State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
²Hangzhou Environmental Monitoring Center Station, Hangzhou 310027, China
³UMR 6614/CORIA, CNRS, BP12 76801 Saint Etienne du Rouvray, France

Received: August 15, 2017
Revised: September 13, 2017
Accepted: September 13, 2017
Download Citation: ||https://doi.org/10.4209/aaqr.2017.08.0271

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Cite this article:
Chen, L., Zhou, J., Zheng, X., Wu, J., Wu, X., Gao, X., Gréhan, G. and Cen, K. (2017). Effects of Carbon Dioxide Addition on the Soot Particle Sizes in an Ethylene/Air Flame. Aerosol Air Qual. Res. 17: 2522-2532. https://doi.org/10.4209/aaqr.2017.08.0271

HIGHLIGHTS

Absorption function are investigated to study the effect of CO₂ dilution.
Flame heights are measured to study the effect on flame structure.
Soot particle sizes are measured to study the effect on soot formation.

ABSTRACT

Carbon dioxide (CO₂) is an important compound for the inhibition of combustion flame. This work investigated the effects of CO₂ 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 CO₂. The total flame height also decreases with CO₂ addition, while the height of the dark region grows. These results show that CO₂ 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.

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