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首页> 外文期刊>Combustion and Flame >Over-rich combustion of CH_4, C_2H_6, and C_3H_8 +air premixed flames investigated by the heat flux method and kinetic modeling
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Over-rich combustion of CH_4, C_2H_6, and C_3H_8 +air premixed flames investigated by the heat flux method and kinetic modeling

机译：通过热通量法和动力学模型研究CH_4，C_2H_6和C_3H_8 +空气预混火焰的过浓燃烧

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摘要

An uncommon non-monotonic behavior of the temperature dependence of adiabatic laminar burning velocity has been found in over-rich methane+air flames at equivalence ratio, phi=1.4. To find out the universality and reasons of this turning point, methane, ethane and propane +air flames are studied both experimentally by the heat flux method and numerically using GRI-mech, USC-mech, UCSD-mech, FFCM mech, and Aramco mech over phi = 0.6-1.8, at unburned temperatures up to 368K, and atmospheric pressure. Results show that the over-rich phenomena stem from a unique flame structure, where, after the flame front, H2O is reduced to H-2 and C2Hx (x>1) is oxidized to CO, causing the temperature overtone (super adiabatic flame temperature), while some key reactions important for flame propagation changing their sensitivity signs. Inside the flame front, the importance of CH3 overwhelms other radicals like OH and H. By these distinguishing features, a method using temperature overtone to identify accurate turning points of over-rich regime is demonstrated. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：绝热层流燃烧速度与温度相关的非寻常非单调行为已在当量比为phi = 1.4的高浓甲烷+空气火焰中发现。为了找出此转折点的普遍性和原因，通过热通量方法对甲烷，乙烷和丙烷+空气火焰进行了实验研究，并使用GRI-mech，USC-mech，UCSD-mech，FFCM和Aramco机械进行了数值研究。在未燃烧温度（最高368K）和大气压下，phi = 0.6-1.8以上。结果表明，过富现象是由独特的火焰结构引起的，在火焰前，H2O还原为H-2，C2Hx（x> 1）被氧化为CO，从而引起温度泛音（绝热火焰温度高） ），而对于火焰传播很重要的一些关键反应会改变其灵敏度符号。在火焰前部，CH3的重要性压倒了其他自由基，如OH和H。通过这些显着特征，展示了一种使用温度泛音来识别过浓状态精确转折点的方法。 （C）2019燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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