NCO quantitative measurement in premixed low pressure flames by combining LIF and CRDS techniques.
NCO quantitative measurement in premixed low pressure flames by combining LIF and CRDS techniques.
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结合 LIF 和 CRDS 技术在预混低压火焰中进行 NCO 定量测量。
DOI：
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发表时间：
2011
影响因子：
2.9
通讯作者：
P. Desgroux
中科院分区：
文献类型：
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作者：
N. Lamoureux;X. Mercier;J. Pauwels;P. Desgroux
NCO是参与NO（x）形成的短寿命物质。它从来没有在火焰条件下定量测量。在本研究中，激光诱导荧光（LIF）和光腔衰荡光谱（CRDS）相结合，测量预混低压火焰（p = 5.3 kPa）中的NCO自由基浓度。在化学计量比的CH（4）/O（2）/N（2）O/N（2）火焰中测量的NCO LIF激发光谱和吸收光谱（CRDS）与用PGOPHER程序计算的NCO在440.479 nm附近的A（2）→（+）-X（2）→跃迁的高温吸收截面的模拟光谱吻合得很好。在化学计量比CH（4）/O（2）/N（2）O/N（2）火焰中测量了相对NCO-LIF分布，其中N（2）O/O（2）比从0.50逐渐减小到0.01，在富CH（4）/O（2）/N（2）预混火焰中测量了相对NCO-LIF分布。然后，在N（2）O掺杂的火焰中，从使用CRDS吸收测量的LIF轮廓被转换成NCO摩尔分数轮廓。
NCO is a short-lived species involved in NO(x) formation. It has never been quantitatively measured in flame conditions. In the present study, laser-induced fluorescence (LIF) and cavity ring-down spectroscopy (CRDS) were combined to measure NCO radical concentrations in premixed low-pressure flames (p = 5.3 kPa). NCO LIF excitation spectrum and absorption spectrum (using CRDS) measured in a stoichiometric CH(4)/O(2)/N(2)O/N(2) flame were found in good agreement with a simulated spectrum using PGOPHER program that was used to calculate the high-temperature absorption cross section of NCO in the A(2)Σ(+)-X(2)Π transition around 440.479 nm. The relative NCO-LIF profiles were measured in stoichiometric CH(4)/O(2)/N(2)O/N(2) flames where the ratio N(2)O/O(2) was progressively decreased from 0.50 to 0.01 and in rich CH(4)/O(2)/N(2) premixed flames. Then, the LIF profiles were converted into NCO mole fraction profiles from the absorption measurements using CRDS in a N(2)O-doped flame.