Effects of Oxygen Volume Fraction on Morphology and Particle Size Evolution of Soot in Laminar Coflow Ethylene Diffusion Flames

被引：0
|
作者：
Han W.-W. [1 ]
Cao W.-J. [1 ]
Chu H.-Q. [1 ]
Gu M.-Y. [1 ]
机构：
[1] School of Energy and Environment, Anhui University of Technology, Ma'anshan
来源：
Chu, Hua-Qiang (hqchust@163.com) | 2018年 / Journal of Propulsion Technology卷 / 39期
关键词：
Deposit morphology; Laminar diffusion flame; Oxygen volume fraction; Soot; Temperature;
D O I：
10.13675/j.cnki.tjjs.2018.12.018
中图分类号：
学科分类号：
摘要：
In order to study the effects of oxygen volume fraction on the formation and evolution of soot particles in laminar coflow diffusion flames of ethylene, SiC fiber deposition and thermophoresis probe sampling methods were used to investigate the soot characteristics at different radial and axial positions in laminar diffusion flame. The results demonstrate that the temperature increases with increasing the oxygen volume fraction at the same location. When the oxygen volume fraction is less than 31% and the flame height is lower than 30mm, the morphology of the soot deposits on the SiC fiber evolves gradually from smooth droplet-like at the centerline to uneven clusters at larger radical locations. With increasing temperature and enhanced role of oxidation, the morphology of soot deposits on the SiC fiber is gradually oxidized into loose cluster-like, flocculent, and final transition to dense clusters and fiber mesh. Under the constant oxygen volume fraction, the average particle size of soot particles increases first and then decreases with the increase of flame height. The diameter of primary particles reached the maximum at 21% oxygen volume fraction and flame height 30mm, which was 41.8nm. At the base of the flame, the average soot particle size increased with the increase of oxygen concentration, the opposite trend was observed at higher flame heights. © 2018, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：2788 / 2797
页数：9
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