Experimental and modeling studies of C2H4/O2/Ar, C2H4/methylal/O2/Ar and C2H4/ethylal/O2/Ar rich flames and the effect of oxygenated additives
Experimental and modeling studies of C2H4/O2/Ar, C2H4/methylal/O2/Ar and C2H4/ethylal/O2/Ar rich flames and the effect of oxygenated additives
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DOI：
10.1016/j.combustflame.2011.01.015
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发表时间：
2011-05
影响因子：
4.4
通讯作者：
V. Dias;J. Vandooren
中科院分区：
文献类型：
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作者：
V. Dias;J. Vandooren
通过测量碳烟前体物的消耗，研究了在富乙烯/氧气/氩气火焰中添加二甲氧基甲烷（DMM或甲缩醛）和二乙氧基甲烷（DEM或乙缩醛）的情况。在一台当量比为2.50的Spalding-Botha型燃烧器上，在低压（50 mbar）下对三种富氧乙烯/氧气/氩气（有、无添加甲缩醛或乙醛）预混火焰进行了稳定实验。识别和监测的信号强度分布的火焰内的物种已经进行了使用分子束质谱（M.B.M.S.）。部分C2 H4被C3 H8 O2或C5 H12 O2取代是导致检测到的中间物种的最大摩尔分数降低的原因。这种现象对于C2-C4中间体是明显的，并且对于C5-C10物种变得更加有效，主要是当C3 H8 O2加入时。一个新的动力学模型已经制定，并包含546个反应和107个化学物种，以模拟三个研究火焰：C2 H4/O2/Ar，C2 H4/DMM/O2/Ar和C2 H4/DEM/O2/Ar。反应机理很好地再现实验摩尔分数的主要和中间物种的配置文件，并强调甲缩醛和乙缩醛添加对这些火焰的物种浓度分布的影响。
The addition of dimethoxymethane (DMM or methylal) and diethoxymethane (DEM or ethylal) to a rich ethylene/oxygen/argon flame has been investigated by measuring the depletion of soot precursors. Three rich premixed ethylene/oxygen/argon (with and without added methylal or ethylal) flat flames have been stabilized at low-pressure (50mbar) on a Spalding–Botha type burner with the same equivalence ratio of 2.50. Identification and monitoring of signal intensity profiles of species within the flames have been carried out by using molecular beam mass spectrometry (M.B.M.S.). The replacement of some C2H4by C3H8O2or C5H12O2is responsible for a decrease of the maximum mole fractions of the detected intermediate species. This phenomenon is noticeable for C2–C4intermediates and becomes more effective for C5–C10species, mainly when C3H8O2added. A new kinetic model has been elaborated and contains 546 reactions and 107 chemical species in order to simulate the three investigated flames: C2H4/O2/Ar, C2H4/DMM/O2/Ar and C2H4/DEM/O2/Ar. The reaction mechanism well reproduces experimental mole fraction profiles of major and intermediate species, and underlines the effect of methylal and ethylal addition on species concentration profiles for these flames.