Study of low pressure premixed laminar dimethyl ether/oxygen/argon flames with different equivalence ratios
Study of low pressure premixed laminar dimethyl ether/oxygen/argon flames with different equivalence ratios
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不同当量比低压预混层流二甲醚/氧/氩火焰的研究
DOI：
10.1016/j.fuel.2018.07.159
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发表时间：
2018-12-15
期刊：
影响因子：
7.4
通讯作者：
Zhang, Chunhua
中科院分区：
文献类型：
--
作者：
Chen, Zhaoyang;Li, Qianqian;Zhang, Chunhua
对不同当量比（0.8、1.0和1.5）的低压预混层流二甲醚/氧/氩火焰进行了实验和数值研究。鉴定了主要中间体，并利用分子束质谱联用同步辐射光电离法测定了它们的摩尔分数。采用预混CODE和具有代表性的二甲醚化学反应模型进行了模拟。分析了当量比对二甲醚火焰结构和反应路径的影响。结果表明，甲醛和甲基是二甲醚火焰中主要的氯中间体。二甲醚主要通过H、OH、CH3和o的吸氢反应来消耗，这些自由基对吸氢反应的影响在不同的当量比下是不同的。大多数由h提取反应形成的甲氧基甲基自由基，在极贫的条件下，迅速发生β裂解，生成甲基和甲醛，只有少量与氧反应。
Low pressure premixed laminar dimethyl ether/oxygen/argon flames with different equivalence ratios (0.8, 1.0, and 1.5) were investigated experimentally and numerically. The major intermediates were identified, and their mole fractions were measured using molecular-beam mass spectrometry combined with synchrotron radiation photoionization. Simulations were performed using PREMIX CODE and a representative chemical reaction model for dimethyl ether. The influence of the equivalence ratio on the flame structure and reaction path of dimethyl ether was analysed. The results show that formaldehyde and methyl are the main Cl intermediates in dimethyl ether flames. Dimethyl ether is mainly consumed through H-abstraction reactions by H, OH, CH3, and O. The effect of these radicals on the H-abstraction reactions varies at different equivalence ratios. Most of the methoxy-methyl radicals formed by the H-abstraction reactions promptly undergo beta-scission into methyl and formaldehyde, with only a small amount reacting with oxygen under extremely lean conditions.