Raman-LIF measurements of temperature, major species, OH, and NO in a methane-air Bunsen flame
Raman-LIF measurements of temperature, major species, OH, and NO in a methane-air Bunsen flame
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DOI：
10.1016/0010-2180(96)00226-x
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发表时间：
1996-06
影响因子：
4.4
通讯作者：
Q. Nguyen;R. Dibble;C. Carter;G. Fiechtner;R. Barlow
中科院分区：
文献类型：
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作者：
Q. Nguyen;R. Dibble;C. Carter;G. Fiechtner;R. Barlow
非侵入式测量温度，主要物种（N2，O2，H2，H2O，CO2，CO，CH 4），OH，和NO在大气压下，层流甲烷-空气本生火焰得到使用拉曼-瑞利散射和激光诱导荧光的组合。在当量比为1.38的三个轴向位置测量径向剖面。测量沿着火焰的中心线，当量比为1.38，1.52，和1.70，也得到了。测量结果表明，内部未燃烧的燃料-空气混合物经历了显着的预热，因为它进入周围的锥形火焰区。因此，中心线轴向温度通常是100-150 K高于绝热平衡的反应物在初始温度为300 K的预测。由于预热的量随当量比增加（由于增加的内部火焰高度），本生火焰中的最高温度（2000 K）是相当不敏感的化学计量。我们观察到减少20%的最大NO浓度（80 ppm）在本生火焰的当量比从1.38增加到1.70。我们还发现，使用一维预混层流火焰模型，将有限速率化学，令人满意地预测性能，如温度，CO，OH和NO浓度在内部火焰。
Nonintrusive measurements of temperature, the major species (N2, O2, H2, H2O, CO2, CO, CH4), OH, and NO in an atmospheric pressure, laminar methane-air Bunsen flame were obtained using a combination of Raman-Rayleigh scattering and laser-induced fluorescence. Radial profiles were measured at three axial locations for an equivalence ratio of 1.38. Measurements along the centerline of the flame, for equivalence ratios of 1.38, 1.52, and 1.70, were also obtained. The measurements indicate that the inner unburned fuel-air mixture experiences significant preheating as it travels up into the conical flame zone surrounding it. Consequently, the centerline axial temperatures were typically 100–150 K higher than predicted by adiabatic equilibrium for reactants at an initial temperature of 300 K. Because the amount of preheating increases with the equivalence ratio (due to the increased inner flame height), the maximum temperatures (2000 K) in a Bunsen flame were rather insensitive to the stoichiometry. We observed a 20% reduction of the maximum NO concentrations (80 ppm) in a Bunsen flame by increasing the equivalence ratio from 1.38 to 1.70. We also find that using a one-dimensional premixed laminar flame model incorporating finite-rate chemistry, satisfactorily predicts properties such as the temperature, CO, OH, and NO concentrations at the inner flame.