Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames
Simultaneous laser-induced fluorescence and Rayleigh scattering measurements of structure in partially premixed flames
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部分预混火焰中结构的同步激光诱导荧光和瑞利散射测量
DOI：
10.1007/s003400000407
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
R. Dibble
中科院分区：
文献类型：
--
作者：
N. Heberle;Gregory P Smith;J. Jeffries;D. Crosley;R. Dibble
激光诱导荧光和瑞利散射的测量进行了良好的稳定，层流部分预混本生型甲烷/空气火焰。同时瑞利散射（温度）和激光诱导荧光（火焰自由基浓度），使精确测定的CH和OH自由基结构的火焰温度梯度的位置。结合详细的火焰化学和一维输运模型，很好地描述了预混内火焰锥直壁中的OH和CH结构。在火焰拉伸增加的区域中的内锥的尖端附近，在火焰的预混合部分的更丰富的化学计量处，以及在由金属插入物扰动的火焰中，CH和OH的测量结构偏离了这个简单的描述。CH浓度的模型预测取决于流量，从而表明应变率的重要性，以促进NOx在这些火焰。
Laser-induced fluorescence and Rayleigh scattering measurements were made in well-stabilized, laminar partially premixed Bunsen-type methane/air flames. Simultaneous Rayleigh scattering (temperature) and laser-induced fluorescence (flame radical concentration) enable precise determination of the position of CH and OH radical structures in the gradient of the flame temperature. The OH and CH structures in the straight walls of the premixed inner flame cone are well described by models incorporating detailed flame chemistry and one-dimensional transport. Near the tip of the inner cone in regions of increased flame stretch, at richer stoichiometries of the premixed portion of the flames, and in flames perturbed by a metal insert, the measured structure of CH and OH deviates from this simple description. CH concentrations predicted by the model depend on flow rate, thus suggesting the importance of strain rate to prompt NOxformation in these flames.