Extinction limits and flame structures of ETBE, DIPE and TAME non-premixed flames
Extinction limits and flame structures of ETBE, DIPE and TAME non-premixed flames
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DOI：
10.1016/j.proci.2016.05.010
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. Hashimoto;J. Hosono;Keisuke Shimizu;Ryota Urakawa;K. Tanoue
中科院分区：
文献类型：
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作者：
J. Hashimoto;J. Hosono;Keisuke Shimizu;Ryota Urakawa;K. Tanoue
在本研究中，使用逆流燃烧器对乙基叔丁基醚（ETBE）、二异丙基醚（DIPE）和叔戊基甲基醚（TAME）非预混火焰进行了消光极限测量。研究是通过从一个管道提供用氮气稀释的燃料和从另一个管道提供由氧气和氮气组成的氧化剂流来进行的。火焰结构也被测量。稳定物质的浓度是通过使用石英微探针从反应区取出气体样品并在气相色谱仪中分析来测量的。使用热电偶测量温度分布。在相同的实验条件下进行了数值计算，验证了醚火焰的化学动力学，阐明了醚火焰的特性。ETBE、DIPE和TAME火焰的实验结果表明，在相同的化学计量混合物分数Zst和平衡温度下，灭光、a2、E时的应变速率几乎相同。不同碳数的醚火焰的对比表明，碳原子数越大，熄灭极限越小。a2、Efor乙醚火焰随着zst和低zst条件的增加而减少一次。在那之后，它们开始增加。zs表示a2的最小值，随着碳原子序数的增加，e变小。每种燃料的温度和主要物种的测量曲线显示出相似的结构。除少数物种外，计算剖面与实验数据吻合较好。讨论了化学动力学计算的可重复性和zst消光极限的变化。
In this study, extinction limits measurements for Ethyl tert-butyl ether (ETBE), Diisopropyl ether (DIPE) and tert-Amyl methyl ether (TAME) non-premixed flames were carried out by using a counterflow burner. Studies were carried out by supplying a fuel diluted with nitrogen from one duct and an oxidizer stream made up of oxygen and nitrogen from the other duct. Flame structures were also measured. Concentrations of stable species were measured by removing gas samples from the reaction zone by using a quartz microprobe and by analyzing them in a gas chromatograph. Temperature profiles were measured by using a thermocouple. Numerical calculations were performed under the same conditions with experiments to validate chemical kinetics and clarify the peculiarity of ether flames. Experimental results for ETBE, DIPE and TAME flames showed almost the same strain rate at extinction,a2,E, at same stoichiometric mixture fraction,Zst, and an equilibrium temperature. Comparisons among ether flames having a different carbon number showed that the larger the number of carbon atoms is, the smaller the extinction limit is.a2,Efor ether flames decrease once with an increase ofZstat lowZstconditions. After that, they start to increase.Zstexpressing the minimum value ofa2,Ebecomes smaller with an increase of carbon atom number. The measured profiles of the temperature and major species showed a similar structure for each fuel. Calculated profiles agreed well with experimental data except for minor species. The reproducibility of chemical kinetic computations and variations in extinction limits withZstwere discussed.