2D computations of FREI with cool flames for n-heptane/air mixture
2D computations of FREI with cool flames for n-heptane/air mixture
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DOI：
10.1016/j.proci.2020.06.010
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
Keisuke Akita;Y. Morii;H. Nakamura;T. Tezuka;K. Maruta
中科院分区：
文献类型：
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作者：
Keisuke Akita;Y. Morii;H. Nakamura;T. Tezuka;K. Maruta
二维轴对称数值模拟再现火焰与重复熄灭和点火（FREI）在微流反应器与控制的温度分布与化学计量的正庚烷/空气混合物，这已经在实验中观察到的。热火焰的点燃发生在消耗反应的CO是在前一个循环的FREI。在热火焰的熄灭和点火位置之间，首次观察到与冷火焰和蓝火焰相关的其他几个热释放速率峰。在热火焰熄灭后，正庚烷低温氧化的冷火焰首先出现，并稳定在低壁温区。在稳定冷焰的下游，出现了由冷焰产物CH 2 O和H2 O2的消耗反应产生的蓝色火焰。之后，在蓝色火焰的下游由剩余的CO发生热火焰点燃。然后在下一个热火焰点燃后，蓝色火焰被传播的热火焰卷走。在热火焰与稳定的冷火焰融合之前不久，冷火焰加强了热火焰的传播。在热火焰与稳定的冷火焰合并之后，热火焰与进入的n-C_7 H_（16）和O_2的新鲜混合物反应。
Two-dimensional axisymmetric numerical simulation reproduced flames with repetitive extinction and ignition (FREI) in a micro flow reactor with a controlled temperature profile with a stoichiometricn-heptane/air mixture, which have been observed in the experiment. The ignition of hot flame occurred from consumption reactions of CO that was remained in the previous cycle of FREI. Between extinction and ignition locations of hot flames, several other heat release rate peaks related to cool and blue flames were observed for the first time. After the extinction of the hot flame, cool flame by the low-temperature oxidation ofn-heptane appeared first and was stabilized in a low wall temperature region. In the downstream of the stable cool flame, a blue flame by the consumption reactions of cool flame products of CH2O and H2O2appeared. After that, the hot flame ignition occurred from the remaining CO in the downstream of the blue flame. Then after the next hot flame ignition, the blue flame was swept away by the propagating hot flame. Soon before the hot flame merged with the stable cool flame, the hot flame propagation was intensified by the cool flame. After the hot flame merged with the stable cool flame, the hot flame reacted with the incoming fresh mixture ofn-C7H16and O2.