A Study on Transient In-Flame Soot Evolution of n-Dodecane Spray

被引：0
|
作者：
Xuan T. [1 ]
Shi Z. [1 ]
Shang W. [2 ]
He Z. [3 ]
Wang Q. [1 ]
机构：
[1] School of Energy and Power Engineering, Jiangsu University, Jiangsu, Zhenjiang
[2] College of Vehicle and Traffic Engineering, Henan University of Science and Technology, Henan, Luoyang
[3] Institute for Energy Research, Jiangsu University, Jiangsu, Zhenjiang
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2024年 / 58卷 / 03期
关键词：
combined extinction and radiation imaging technique; Eulerian spray model; n-dodecane; soot formation characteristics;
D O I：
10.7652/xjtuxb202403002
中图分类号：
学科分类号：
摘要：
Capturing the transient evolution of soot under diesel-like conditions through experimental methods is challenging. The transient formation characteristics and kinetic of soot in-flame of n-dodecane spray under high-temperature and high-pressure conditions is investigated in present study. Experimentally, the combined extinction and radiation (CER) methodology and combustion image velocimetry (CIV) are applied to capture the transient distributions of soot volume fraction, soot temperature, and soot velocity field of n-dodecane spray flames from a single-hole injector under high-temperature and high-pressure conditions. Numerically, a coupled model combining the Eulerian spray model and unsteady flame progress variable combustion model is developed in the OpenFOAM environment. The numerical results of the spray combustion process exhibit a high level of agreement with experimental data. The results show that, compared to the reference condition, in the lower injection pressure condition, the shorter lift-off length (LOL) and the longer soot residence time within the interval equivalence ratio Φ 2 significantly propel the formation of soot, leading to an 80% increase in peak soot mass. In the higher-temperature condition, there is no significant difference in the soot residence time within the interval Φ > 2, while the shorter LOL leads the fuel to ignite at higher equivalence ratios, resulting in a significant increase in soot formation?with an 88% increase in peak soot mass. In the oxygen-rich condition, the flame temperature is the highest, which increase the particle velocity of soot. Consequently, the residence time of soot within the interval Φ > 2 is significantly reduced. Additionally, owing to the lower equivalence ratio in the flame, peak soot mass is reduced by 42%. © 2024 Xi'an Jiaotong University. All rights reserved.
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页码：15 / 24
页数：9
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