Ignition-delay-time/time-resolved CO2-concentration measurements during the combustion of iC(4)H(10)/H-2 mixtures
Ignition-delay-time/time-resolved CO2-concentration measurements during the combustion of iC(4)H(10)/H-2 mixtures
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iC(4)H(10)/H-2 混合物燃烧期间的点火延迟时间/时间分辨 CO2 浓度测量
DOI：
10.1016/j.fuel.2020.118980
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发表时间：
--
期刊：
影响因子：
7.4
通讯作者：
Ding Yanjun
中科院分区：
文献类型：
--
作者：
He Dong;Peng Zhimin;Ding Yanjun
利用可调谐二极管激光吸收光谱技术，在激波管实验中测量了iC（4）H（10）/H-2混合物在1310-1450 K和CO2浓度下的点火延迟时间。目的是确定使用异丁烷作为添加剂改变氢反应性的性能。将实测数据与基于AramcoMech 2.0、Hychem模型和CRECK机理的预测进行了比较。结果表明，使用AramcoMech 2.0获得的数据与测量数据最吻合。生成路径分析表明，三种机制在所选时间点提供了不同的异丁烷氧化和CO2生成路径。本研究进一步比较了正丁烷和异丁烷作为添加剂对富氢燃料反应性的影响。添加异丁烷比添加等量正丁烷能更明显地延长富氢混合气的着火延迟期。异丁烷表现出类似的初始氧化正丁烷，但通过直接单分子分解的渠道较少。基于AramcoMech 2.0的CO2生成路径分析表明，在选定的时间点，CO + OH = CO2 + H在正丁烷燃烧过程中的CO2生成通道中所占的比例高于异丁烷燃烧过程。
This study measured the ignition delay times of iC(4)H(10)/H-2 mixtures in shock-tube experiments at 1310-1450 K and time-resolved CO2 concentrations by combining tunable diode laser absorption spectroscopy. The aim was to determine the performance of using isobutane as additive in changing hydrogen reactivity. The measured data were compared with predictions based on the three mechanism, namely, AramcoMech 2.0, Hychem model and CRECK mechanism. Results showed that data obtained using AramcoMech 2.0 best agreed with the measured data. Formation-path analyses demonstrated that the three mechanism provided different isobutane oxidation and CO2 formation paths at the selected time point..This study did further comparisons between n-butane and isobutane as additives to check the performance of butane and its isomer in changing hydrogen-enriched-fuel reactivity. Adding isobutane was found to prolong the ignition delay times of hydrogen-enriched mixtures more evidently than adding the same amount of n-butane. Isobutane showed similar initial oxidation as n-butane but had fewer channels through direct unimolecular decomposition. CO2 formation-path analyses based on AramcoMech 2.0 demonstrated that CO + OH = CO2 + H occupies a higher proportion in CO2 formation channels during n-butane combustion than during isobutane combustion at the selected time point.