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MODELING OF OXIDATION-DRIVEN SOOT AGGREGATE FRAGMENTATION IN A LAMINAR COFLOW DIFFUSION FLAME

机译:层流顺流扩散火焰中氧化驱动的烟气团聚破碎模型

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摘要

In this study, three different oxidation-driven soot aggregate fragmentation models with 1:1, 2:1, and 10:1 fragmentation patterns are developed and implemented into a laminar coflow ethylenelair diffusion flame, together with a pyrene-based soot model and a sectional aerosol dynamics model. It is found that the average degree of particle aggregation (n_p) in the soot oxidation region is not correctly predicted if oxidation-driven aggregate fragmentation is neglected; whereas the incorporation of aggregate fragmentation significantly improves the n_p prediction in the soot oxidation region. Similar results are obtained using the 1:1 and 2:1 fragmentation patterns. However, as the pattern ratio increases to 10:1, appreciable difference in the predicted n_p is observed. As the pattern ratio becomes larger, the fragmentation effect diminishes and the predicted n_p approaches that of the original model neglecting fragmentation.
机译:在这项研究中,开发了三种具有1:1、2:1和10:1碎裂模式的氧化驱动烟灰聚集体破碎模型,并将其与基于a的烟灰模型和截面气溶胶动力学模型。发现如果忽略了氧化驱动的聚集体碎裂,则不能正确预测烟灰氧化区域中的平均颗粒聚集度(n_p)。而聚集体碎片的掺入可显着改善烟灰氧化区域中的n_p预测。使用1:1和2:1片段化模式可获得相似的结果。但是,随着图案比率增加到10:1,可以观察到预测n_p的明显差异。随着图案比例变大,碎片效果减小,并且预测的n_p接近忽略碎片的原始模型。

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