Spatially resolved absolute concentration and fluorescence-lifetime determination of H2CO in atmospheric-pressure CH4/air flames
Spatially resolved absolute concentration and fluorescence-lifetime determination of H2CO in atmospheric-pressure CH4/air flames
复制标题
常压 CH4/空气火焰中 H2CO 的空间分辨绝对浓度和荧光寿命测定
DOI：
10.1007/s003400000479
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Wolfrum
中科院分区：
文献类型：
--
作者：
D. Shin;T. Dreier;J. Wolfrum
翻译后摘要：使用激光诱导荧光（LIF），甲醛（H2 CO）的空间分辨的浓度分布，获得了在预热区的大气压预混甲烷/空气火焰稳定的中心槽的多槽燃烧器类似于国内锅炉的建设。在210410振动组合跃迁中，在OA 2-
在339 nm附近激发的{X} 1A 1电子带系处于线性LIF强度区。为了量化对所测量的LIF信号强度的淬灭效应，从直接荧光寿命确定相对荧光量子产率作为狭缝出口上方高度的函数。火焰中的绝对H2 CO数密度进行了评估，从校准测得的LIF信号强度与在低压样品中获得的已知H2 CO蒸气压。贫燃和富燃火焰中的峰值浓度分别达到（994±298）和（174±52）ppm。
Abstract.Using laser-induced fluorescence (LIF), spatially resolved concentration profiles of formaldehyde (H2CO) were obtained in the preheating zone of atmospheric-pressure premixed CH4/air flames stabilized on the central slot of a multiple-slot burner similar in construction to domestic boilers. The isolated pQ1(6) rotational line (339.23 nm) in the 210410 vibronic combination transition in the Ã1A2-
\tilde{X}1A1 electronic band system around 339 nm was excited in the linear LIF intensity regime. For a quantification of quenching effects on the measured LIF signal intensities, relative fluorescence quantum yields were determined from direct fluorescence lifetime as a function of height above the slot exit. Absolute H2CO number densities in the flames were evaluated from a calibration of measured LIF signal intensities versus those obtained in a low-pressure sample with a known H2CO vapor pressure. Peak concentrations in the slightly lean and rich flames reached (994±298) and (174±52) ppm, respectively.