Investigation of the chemical structures of laminar premixed flames fueled by acetaldehyde
Investigation of the chemical structures of laminar premixed flames fueled by acetaldehyde
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DOI：
10.1016/j.proci.2016.05.030
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Tao Tao-Tao;Wenyu Sun;Bin Yang;N. Hansen;K. Moshammer;C. Law
中科院分区：
文献类型：
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作者：
Tao Tao-Tao;Wenyu Sun;Bin Yang;N. Hansen;K. Moshammer;C. Law
乙醛是碳氢化合物和含氧燃料燃烧过程中形成的关键中间体，其对空气的污染作用引起了人们的关注。更好地了解其燃烧特性对于开发核心机制和减少相关排放具有重要意义。本文采用同步加速器真空紫外光电离的分子束质谱法，测定了当量比为1.7和1.0的低压层流预混乙醛火焰的化学结构。总共鉴定了大约40种，报道了它们的摩尔分数分布，估计了很好的不确定性。据我们所知，一些含氧物质，如乙醇和丁醛，是第一次在乙醛火焰中测量的。利用几种可用的动力学机制，比较了实验物种摩尔分数曲线的建模结果。这些机制很好地再现了主要物种和C1/ c2碳氢化合物中间体的摩尔分数分布，然而，它们对一些与燃料相关的含氧中间体（如c2h30异构体）的预测能力令人不满意，这表明乙醛亚机制需要进一步研究。我们的实验结果为今后的机理研究提供了有价值的信息。
Acetaldehyde is a key intermediate formed during the combustion of hydrocarbon and oxygenated fuels, and its role as an air pollution is concern-arousing. A better understanding of its combustion characteristics is of significance in developing core mechanisms and reducing the associated emissions. In this work, chemical structures of low-pressure laminar premixed acetaldehyde flames with equivalence ratios of 1.7 and 1.0 were measured by employing molecular-beam mass spectrometry with synchrotron vacuum ultraviolet light for ionization. Totally, about 40 species were identified and their mole fraction profiles are reported with well estimated uncertainty. To our knowledge, some oxygenated species, such as ethenol and butanal, were measured for the first time in acetaldehyde flames. Experimental species mole fraction profiles were compared with modeling results using several available kinetic mechanisms. These mechanisms well reproduce the mole fraction profiles of the major species and the C1/C2hydrocarbon intermediates, however, their unsatisfactory predictive capability for some fuel-related oxygenated intermediates, such as C2H3O isomers, suggests that the acetaldehyde sub-mechanism needs further investigation. Our experimental results provide valuable information for future mechanism development.