Time-resolved CO2 concentration and ignition delay time measurements in the combustion processes of n-butane/hydrogen mixtures
Time-resolved CO2 concentration and ignition delay time measurements in the combustion processes of n-butane/hydrogen mixtures
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正丁烷/氢气混合物燃烧过程中的时间分辨二氧化碳浓度和点火延迟时间测量
DOI：
10.1016/j.combustflame.2019.05.041
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发表时间：
2019-09
影响因子：
4.4
通讯作者：
Ding Yanjun
中科院分区：
文献类型：
--
作者：
He Dong;Peng Zhimin;Ding Yanjun
为了研究富氢正丁烷混合物的动力学特性，本研究结合激光吸收诊断，测量了激波管试验中nC4H10/ h2混合物的点火延迟时间和燃烧过程中时间分辨的co2浓度。将实验数据与三种动力学机制的数值预测结果进行了比较，结果表明改进的NUIG模型在预测点火延迟时间和时间分辨co2浓度方面表现出更好的性能。nC4H10:H2ratio越高，反应活性越低，因为nC4H10氧化后主要发生燃烧。稀薄混合物（ϕ= 0.5）的点火速度明显快于化学计量混合物。由于不同的燃烧特性，可以调整nc4h10与H2in燃料混合物的比例以适应燃烧室的设计。co2的形成发生在nc4h10完全氧化后，主要来源是小分子或自由基。反应路径分析表明，近一半的CO2是通过CO + OH = CO2+ H反应生成的。
In order to research kinetics properties of hydrogen-enriched n-butane mixtures, this study measured the ignition delay time of nC4H10/H2mixtures in shock tube tests and time-resolved CO2concentrations during combustion process by combining laser absorption diagnostics. The experimental data were compared with numerical predictions from three kinetic mechanisms, and the modified NUIG Mech shows improved performances in predicting ignition delay time and time-resolved CO2concentrations. Higher nC4H10:H2ratio led to lower reactivities because the main combustion happens after the oxidation of nC4H10. Lean mixtures (ϕ= 0.5) ignites significantly faster than stoichiometric mixtures. It is possible to adjust ratios of nC4H10to H2in fuel mixture to fit the combustor design because of the varying combustion characteristics. The CO2formation occurs after complete oxidation of nC4H10with the primary sources being small molecules or radicals. Reaction path analyses show that nearly half of the CO2is formed through the reaction CO + OH = CO2+ H.
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