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The effect of fuel composition and Reynolds number on soot formation processes in turbulent non-premixed toluene jet flames
Proceedings of the Combustion Institute ( IF 3.4 ) Pub Date : 2020-09-22 , DOI: 10.1016/j.proci.2020.06.140
Stephan Kruse , Paul Medwell , Marco Davidovic , Zhiwei Sun , Jingjing Ye , Heinz Pitsch , Bassam B. Dally

The soot formation processes in three different turbulent prevaporized non-premixed toluene jet flames stabilized on a jet-in-hot-coflow (JHC) burner were investigated in this study. The jet Reynolds number and the stoichiometric mixture fraction were varied in order to manipulate the flow time scales and the chemistry, respectively. Time-resolved laser-induced incandescence (TiRe-LII), non-linear two-line atomic fluorescence of indium (nTLAF), and OH planar laser induced fluorescence (PLIF) were simultaneously applied to yield spatially resolved and instantaneous fields of soot volume fraction, primary particle size, temperature, and OH. The mean distributions of the detected quantities are used to identify major differences among the flames. The highest soot loading is observed for the low Reynolds number and low stoichiometric mixture fraction flame. However, this flame features also the lowest temperature and primary particle size. Based on these observations, the simultaneously detected data sets and flamelet computations are employed to elucidate differences in the soot formation pathways in the flames. The analyses reveal that the high soot loading causes greater heat losses in the low Reynolds number and low stoichiometric mixture fraction flame. This has a significant impact on the soot formation pathways and causes a reduction in the particle size.



中文翻译:

燃料成分和雷诺数对湍流非预混甲苯射流火焰中烟灰形成过程的影响

在此研究中,研究了三种不同的湍流预蒸发的非预混合甲苯射流火焰的烟尘形成过程,这些火焰稳定在热喷流(JHC)燃烧器中。改变喷射雷诺数和化学计量的混合物分数以分别控制流动时间标度和化学性质。同时应用时间分辨激光诱导白炽灯(TiRe-LII),铟的非线性两线原子荧光(nTLAF)和OH平面激光诱导荧光(PLIF),以产生烟灰体积分数的空间分辨和瞬时场,一次粒径,温度和OH。检测到的量的平均分布用于识别火焰之间的主要差异。对于低雷诺数和低化学计量的混合物分数火焰,观察到最高的烟灰负荷。但是,这种火焰还具有最低的温度和一次粒径。基于这些观察,同时检测到的数据集和小火焰计算可用来阐明火焰中烟灰形成途径的差异。分析表明,高烟灰负载会在低雷诺数和低化学计量的混合分数火焰中产生更大的热损失。这对烟灰形成途径有重大影响,并导致粒径减小。同时检测到的数据集和小火焰计算可用来阐明火焰中烟灰形成途径的差异。分析表明,高烟灰负载会在低雷诺数和低化学计量的混合分数火焰中产生更大的热损失。这对烟灰形成途径有重大影响,并导致粒径减小。同时检测到的数据集和小火焰计算可用来阐明火焰中烟灰形成途径的差异。分析表明,高烟灰负载会在低雷诺数和低化学计量的混合分数火焰中产生更大的热损失。这对烟灰形成途径有重大影响,并导致粒径减小。

更新日期:2020-09-22
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