Low temperature ignition delay times measurements of 1,3,5-trimethylbenzene by rapid compression machine
Low temperature ignition delay times measurements of 1,3,5-trimethylbenzene by rapid compression machine
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快速压缩机测定1,3,5-三甲苯的低温着火延迟时间
DOI：
10.1016/j.fuel.2018.12.077
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发表时间：
2019
期刊：
影响因子：
7.4
通讯作者：
Zuohua Huang
中科院分区：
文献类型：
--
作者：
Yang Liu;Chenglong Tang;Yingtao Wu;Meng Yang;Zuohua Huang
由于人们对作为喷气燃料替代组分的大烷基芳烃的燃烧化学的了解日益增加，我们使用经过验证的带加热系统的快速压缩机，在温度范围为880 ~ 1090 K，压力为20.0 ~ 30.0 bar，不同的混合当量比和燃料浓度下，提供了1,3,5-三甲基苯/O2/Ar混合物的新的点火延迟时间数据。测量表明，该燃料没有观察到负温度系数行为。随后，这些低温点火延迟时间数据被用于验证几种动力学机制，包括Gudiyella和Brezinsky（燃烧火焰2012），disamvart等人（燃料2013）和Wang等人（燃烧火焰2018），所有这些都显著高估了1,3,5-三甲基苯在该温度范围内的反应性。典型条件下的敏感性分析和不同模型下点火优势反应的速率常数比较表明，需要进一步研究更完整的1,3,5-三甲苯（T135MB）的反应方案和更精确的速率常数，特别是T135MB的提氢反应和燃料自由基消耗反应。在相同条件下，甲苯的点火延迟时间低于T135MB和正丙苯，说明侧链数越多，侧链长度越长，低温反应活性越强。此外，对于相同的燃料异构体，侧链长度对加速点火的影响大于侧甲基数，因为正丙苯的点火延迟时间比T135MB更短。本文的工作对未来喷气燃料替代模型的开发具有一定的参考价值。
Due to the increased interest on understanding the combustion chemistry of the larger alkyl aromatic as jet fuel surrogate component, we provide new ignition delay time data of 1,3,5-trimethylbenzene/O2/Ar mixtures, for the temperature range between 880 and 1090 K, at the pressure of 20.0 and 30.0 bar and for different mixture equivalence ratio and fuel concentration, by using a well validated rapid compression machine with heating system. Measurements show that no negative temperature coefficient behavior was observed for this fuel. Subsequently, these low temperature ignition delay time data were used to validate several kinetic mechanisms including those of Gudiyella and Brezinsky (Combust Flame 2012), Diévart et al. (Fuel 2013), and Wang et al. (Combust Flame 2018), all of which significantly overestimate the reactivity of 1,3,5-trimethylbenzene in this temperature range. Sensitivity analysis at typical condition and comparisons of the rate constants of the ignition dominant reactions in different models indicate that a more complete reaction scheme for 1,3,5-trimethylbenzene (T135MB) and more accurate rate constant should be further pursued, especially for the reactions of H abstraction from T135MB and fuel radical consumption reactions. Finally, ignition delay times of toluene is lower than T135MB and n-propylbenzene at the same condition, which indicate that the larger number of side chain and the longer side chain length enhances the low temperature reactivity. In addition, for the same fuel isomer, the effect of the side chain length is stronger than the number of side methyl in accelerating ignition since n-propylbenzene presents an even shorter ignition delay times than T135MB. We believe the present work will be of merit for future jet fuel surrogate model development.