Characteristics of n-heptane and toluene weak flames in a micro flow reactor with a controlled temperature profile
Characteristics of n-heptane and toluene weak flames in a micro flow reactor with a controlled temperature profile
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DOI：
10.1016/j.proci.2012.06.099
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Hori;H. Nakamura;T. Tezuka;S. Hasegawa;K. Maruta
中科院分区：
文献类型：
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作者：
M. Hori;H. Nakamura;T. Tezuka;S. Hasegawa;K. Maruta
以汽油代用品的主要组分正庚烷和甲苯为研究对象，在温度分布可控的微流反应器中进行了实验研究。通过研究在反应器中低流速条件下观察到的弱火焰来检查它们的点火过程。使用正庚烷/空气、甲苯/空气和混合燃料（正庚烷+甲苯）/空气混合物在化学计量下捕获弱火焰图像。结果表明，随着甲苯含量的增加，正庚烷的热火焰温度向高温区移动，表明甲苯对正庚烷的着火有抑制作用。此外，该反应器的能力，以静态观察在低温范围内的甲苯着火过程被证明。用PRF+甲苯的化学动力学计算很好地再现了实验结果。对正庚烷、甲苯及其混合燃料的弱火焰进行了气体采样分析。除了甲苯/空气的情况下，测量和计算的摩尔分数的主要物种之间的比较显示出良好的定性协议。在P=5atm下，对正庚烷和正庚烷+甲苯混合燃料的弱火焰进行了实验研究，考察了在正庚烷中添加甲苯对高压着火过程的影响。甲苯的加入削弱了提高其高压反应活性的低温反应，并对主要反应过程热焰起着明显的抑制作用。
n-Heptane and toluene, which are major components of gasoline surrogate, were applied to a micro flow reactor with a controlled temperature profile. Their ignition processes were examined by investigating weak flames observed in the low flow velocity condition in the reactor. Weak flame images were captured using n-heptane/air, toluene/air, and blended fuel (n-heptane+toluene)/air mixtures all at the stoichiometry. Results showed that hot flame shifted significantly to a higher temperature range with the increase of toluene fraction in the fuel, which indicates ignition inhibition by toluene addition to n-heptane. Furthermore, the capability of the reactor to stationary observe the ignition process of toluene in low temperature range was demonstrated. Computation with the chemical kinetics of PRF+toluene reproduced the experimental results very well. Gas sampling analyses were done for weak flames of n-heptane, toluene, and their blended fuel. Comparison between measured and computational mole fraction profiles of major species showed a good qualitative agreement except for the case of toluene/air. Weak flames for n-heptane and n-heptane+toluene blended fuel at P=5atm were observed to examine the effect of toluene addition to n-heptane on ignition process at elevated pressure. Low temperature reaction which increases its reactivity at elevated pressure was weakened and the main reaction process, hot flame showed obvious ignition inhibition by the toluene addition.