The formation, growth, and oxidation of soot in turbulent prevaporized toluene diffusion flames stabilized on a jet-in-hot-coflow (JHC) burner are investigated in this study. Flame structure, local gas temperature as well as local soot volume fraction and primary soot particle diameter, are simultaneously detected by means of OH planar laser-induced fluorescence (PLIF), non-linear excitation regime two-line atomic fluorescence (nTLAF) of indium, and time-resolved (TiRe) laser-induced incandescence (LII), respectively. The collected data sets were used to generate joint statistics of soot properties and flame characteristics and provided new insights into the interaction of the OH layer and soot in turbulent flames. The interaction of OH and soot as a driving mechanism for soot oxidation is of particular interest as it has been proven to be challenging to model. Statistics of soot volume fraction and primary particle size in the OH layer are employed to gain deeper insights into the soot oxidation process. Mean soot volume fraction and primary soot particle size conditioned on temperature and OH signal intensity indicate that, due to differential diffusion of soot with respect to the chemical species, high soot volume fraction and primary soot particle diameter of up to 50 nm are present at low temperatures and low OH concentration. In the soot oxidation region, statistical analysis of the soot parameters disclose that clusters of high soot volume fraction mostly consist of large primary particles. Observations from instantaneous images and the presence of large primary particles inside the OH layer suggest that the oxidation is not sufficiently fast to burn the soot completely.

在此研究中，研究了稳定在射流热气流（JHC）燃烧器中的湍流预蒸发甲苯扩散火焰中烟尘的形成，生长和氧化。通过OH平面激光诱导荧光（PLIF），铟的非线性激发态两线原子荧光（nTLAF）同时检测火焰结构，局部气体温度以及局部烟灰体积分数和一次烟灰粒径，和时间分辨（TiRe）激光诱导的白炽灯（LII）。收集的数据集用于生成烟灰特性和火焰特性的联合统计数据，并为湍流火焰中OH层和烟灰的相互作用提供了新的见解。OH和烟灰的相互作用作为烟灰氧化的驱动机制特别受关注，因为已证明建模存在挑战性。利用OH层中烟灰体积分数和一次粒径的统计数据，可以更深入地了解烟灰氧化过程。以温度和OH信号强度为条件的平均烟灰体积分数和初级烟灰粒径表明，由于烟灰相对于化学物质的差异扩散，低烟尘体积分数和高达50 nm的初级烟灰粒径存在。温度和低OH浓度。在烟灰氧化区域，对烟灰参数的统计分析表明，高烟灰体积分数的簇主要由大的初级颗粒组成。