HCO concentration in flames via quantitative laser-induced fluorescence

Symposium (International) on Combustion Pub Date : 1998-01-01 DOI:10.1016/S0082-0784(98)80434-7

Eric W.-G. Diau , Gregory P. Smith, Jay B. Jeffries, David R. Crosley

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引用次数: 7

Abstract

Quantitative laser-induced fluorescence (LIF) measurements of the concentration of HCO are made in three 25-torr methane-oxygen-nitrogen flames: fuel lean (φ=0.81), near stoichiometric (φ=1.07), and fuel rich (φ=1.28). LIF is excited in the (000)-(000) band of the B-X system near 258 nm. The LIF signal from the flame is calibrated against nonflame measurements of a known HCO concentration produced by laser photolysis of acetaldehyde. The LIF signal is adjusted for the variation in the fraction of the population of the laser-excited level as the measured temperature changew with position in the flame and for the measured variation in quenching. The resulting concentration measurements agree well with model predictions for the fuel-lean and near-stoichiometric flame. The measurements in the fuel-rich flame are significantly larger than the model predictions: however, these measurements are subject to increased uncertainty due to the large, broadband background in the rich flame.

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火焰中的HCO浓度通过定量激光诱导荧光

定量激光诱导荧光(LIF)测量了在三个25 torr甲烷-氧-氮火焰中HCO的浓度:燃料稀薄(φ=0.81)，接近化学计量(φ=1.07)和燃料丰富(φ=1.28)。LIF在B-X系统258 nm附近的(000)-(000)波段被激发。来自火焰的LIF信号是根据由激光光解乙醛产生的已知HCO浓度的非火焰测量进行校准的。LIF信号被调整为随测量温度随火焰中位置的变化而变化的激光激发能级的总体比例的变化，以及淬火的测量变化。所得到的浓度测量值与模型对燃料稀薄和接近化学计量火焰的预测结果吻合得很好。富燃料火焰中的测量值明显大于模型预测值:然而，由于富燃料火焰中较大的宽带背景，这些测量值受到不确定性增加的影响。

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Symposium (International) on Combustion

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