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A comparative study on the sooting tendencies of various 1-alkene fuels in counterflow diffusion flames

机译：各种1-烯烃燃料在逆流扩散火焰中积碳趋势的比较研究

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Alkenes are important components in transportation fuels, and are known to have increased sooting tendencies compared to analogous saturated hydrocarbons with the same carbon number. This work aims to understand the sooting tendencies of various 1-alkenes through experiments and numerical simulations for counterflow diffusion flames. Soot and PAH formation tendencies of 1-alkene fuels, including ethylene (C2H4), propene (C3H6), 1-butene (1-C4H8), 1-pentene (1-C5H10), 1-hexene (1-C6H12) and 1-octene (1-C8H16), were experimentally studied using laser induced-incandescence (LII) and laser-induced fluorescence (LIF) techniques, respectively. From the LII results, 1-C4H8 was found to be the most sooting fuel, followed by C3H6 1-C5H10 1-C6H12 1-C8H16 C2H4. The LIF data with a detection wavelength of 500 nm indicated the PAH formation tendencies followed the order of 1-C4H18 1-C5H10 similar to 1-C6H12 C3H(6) 1-C8H16 C2H4, which were different from the order of sooting tendencies. Numerical simulations with a comprehensive chemical kinetic model including PAH growth chemistry for the tested 1-alkene fuels were conducted to elucidate the aromatic formation pathways and rationalize the experimentally observed trends. The numerical results highlighted the importance of intermediate species with odd carbon numbers in aromatic species formation, such as propargyl, allyl, cyclopentadienyl and indenyl radicals. Their concentration differences, which could be traced back to the parent fuel molecules through rate of production analysis, rationalize the experimentally observed differences in soot and PAH formation tendencies. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：烯烃是运输燃料中的重要组分，并且与具有相同碳数的类似饱和烃相比，已知其具有增加的烟灰趋势。这项工作旨在通过实验和逆流扩散火焰的数值模拟来了解各种1-烯烃的烟灰趋势。 1-烯烃燃料的烟尘和PAH形成趋势，包括乙烯（C2H4），丙烯（C3H6），1-丁烯（1-C4H8），1-戊烯（1-C5H10），1-己烯（1-C6H12）和1 -辛烯（1-C8H16），分别使用激光诱导白炽灯（LII）和激光诱导荧光（LIF）技术进行了实验研究。根据LII结果，发现1-C4H8是最烟so的燃料，其次是C3H6> 1-C5H10> 1-C6H12> 1-C8H16> C2H4。检测波长为500 nm的LIF数据表明PAH形成趋势遵循1-C4H18> 1-C5H10的顺序，类似于1-C6H12> C3H（6）> 1-C8H16> C2H4的顺序，与烟灰倾向。进行了包括PAH生长化学在内的全面化学动力学模型的数值模拟，以测试被测的1-烯烃燃料，以阐明芳烃的形成途径并合理化实验观察到的趋势。数值结果突出了具有奇数碳原子的中间物种在芳香族物种形成中的重要性，例如炔丙基，烯丙基，环戊二烯基和茚基。它们的浓度差异可以通过生产速率分析追溯到母体燃料分子，从而合理化实验观察到的烟灰和PAH形成趋势差异。 （C）2018年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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