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本文采用详细化学反应机理数值研究了添加不同稀释气体(氦气/氩气/氮气/二氧化碳)对甲烷/空气预混气体点火的影响,比较了氢气/空气/二氧化碳和甲烷/空气/二氧化碳的最小点火能与稀释极限。研究结果表明:稀释气体的热力学效应和火焰动力学效应均会导致最小点火能变大;在添加二氧化碳时,甲烷/空气的稀释极限远低于氢气/空气的稀释极限。
In this paper, the effect of adding different dilution gases (helium / argon / nitrogen / carbon dioxide) on the ignition of methane / air premixed gas was numerically investigated by the detailed chemical reaction mechanism and the minimum of hydrogen / air / carbon dioxide and methane / air / carbon dioxide Ignition and dilution limit. The results show that both the thermodynamic effect of dilution gas and the flame kinetic effect can lead to the smallest ignition energy. When carbon dioxide is added, the dilution limit of methane / air is much lower than the dilution limit of hydrogen / air.