Effect of DME on soot formation in acetylene/air flame


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The paper presents the results of an experimental and numerical study of the effect of DME additives on the soot particles formation and growth in the acetylene/air flame. Soot particles produced in a flat, laminar, premixed acetylene/air flame with a content from 0 to 15.4% DME were studied in-situ by laser extinction (LE) method and ex-situ by transmission elec-tron microscopy (TEM). The method of laser extinction at wavelengths from 405 to 850 nm allowed to obtain data on the volume fraction of condensed phase in the flame, as well as on their optical band gap. The average soot particles size was extracted from the analysis of TEM exposures. Kinetic modeling was carried out using a modern kinetic mechanism of py-rolysis and oxidation of hydrocarbons, including a sectional model of the growth of soot par-ticles. As a result, it is shown that DME additives lead to a decrease in the soot yield, a de-crease in the average size of soot particles, as well as a change in their optical and electrical-ly conductive properties.

soot formation, soot particles, flat premixed flame, acetylene combustion, DME.

DOI: http://doi.org/10.33257/PhChGD.25.7.1147

Alexander Drakon, Alexander V. Eremin, Roman Kolotushkin, Alyona Timoshenko, Egor Khodyko

Volume 25, issue 7, 2024 year


Влияние ДМЭ на процесс сажеобразования в пламени ацетилен/воздух

В работе представлены результаты экспериментального и численного исследования влияния добавки ДМЭ на процесс образования и роста сажевых частиц в пламени ацетилен/воздух. Частицы сажи, синтезированные в плоском, ламинарном, предварительно-перемешанном пламени ацетилен/воздух с содержанием от 0 до 15,4% ДМЭ, были исследованы in-situ методом лазерной экстинкции (ЛЭ) и ex-situ методом просвечивающей электронной микроскопии (ПЭМ). Метод лазерной экстинкции на длинах волн от 405 до 850 нм позволил получить данные об объемной доле конденсированных частиц в пламени, а также об их оптической ширине запрещенной зоны. Из анализа фотографий просвечивающего электронного микроскопа получена информация о среднем размере частиц. Проведено численное моделирование с использованием современного кинетического механизма пиролиза и окисления углеводородов, включающего секционную модель роста сажевых частиц. В результате показано, что добавки ДМЭ приводят к снижению выхода сажи, уменьшению среднего размера сажевых частиц, а также изменению их оптических и электропроводных свойств.

сажеобразование, частицы сажи, плоское пламя, горение ацетилена, ДМЭ.

DOI: http://doi.org/10.33257/PhChGD.25.7.1147

Alexander Drakon, Alexander V. Eremin, Roman Kolotushkin, Alyona Timoshenko, Egor Khodyko

Volume 25, issue 7, 2024 year



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