Abstract Numerical simulation of soot formation in a laminar premixed burner-stabilized ethylene stagnation flame was performed with a detailed population balance model (DPBM) capable of tracking full structural details of aggregates as well as their chemical composition. A thorough parametric sensitivity study was carried out to understand the influence of individual sooting processes on the computed primary particle size distributions (PPSDs). The rate of production of pyrene, coagulation efficiency and surface growth rate were found to have significant effects on the computed PPSDs. Besides, we found that the instantaneous sintering between small primary particles (PP) can affect the computed PPSDs drastically while sintering between large PPs within aggregates only had mild effects. For an ethylene premixed flame with stagnation plate height being 1.2 cm (Combust. Flame, 198:428-435, 2018), good agreement was obtained between both the computed and measured PPSD and fractal dimension, which supports the current mechanisms contributing to the evolution of PPs, i.e. nucleation, coagulation, surface growth and sintering. Moreover, time scale analysis for individual sooting processes was performed to determine the dominant particle processes at different periods of time, which helped explain the evolution of soot morphology.

中文翻译：

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预混乙烯停滞火焰中初级粒度分布的模拟

摘要 层流预混燃烧器稳定的乙烯滞流火焰中烟灰形成的数值模拟是使用详细的人口平衡模型 (DPBM) 进行的，该模型能够跟踪集料的完整结构细节及其化学成分。进行了彻底的参数敏感性研究，以了解单个烟尘过程对计算的初级粒度分布 (PPSD) 的影响。发现芘的产生速率、凝结效率和表面生长速率对计算的 PPSD 有显着影响。此外，我们发现小初级粒子 (PP) 之间的瞬时烧结会极大地影响计算的 PPSD，而聚集体内大 PP 之间的烧结仅具有轻微影响。对于停滞板高度为 1.2 cm 的乙烯预混火焰 (Combust. Flame, 198:428-435, 2018)，计算和测量的 PPSD 和分形维数之间获得了良好的一致性，这支持了当前促进演化的机制PPs，即成核、凝结、表面生长和烧结。此外，对单个烟尘过程进行了时间尺度分析，以确定不同时间段的主要粒子过程，这有助于解释烟尘形态的演变。