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首页> 外文期刊>Combustion and Flame >Multi-isotopologue laser absorption spectroscopy of carbon monoxide for high-temperature chemical kinetic studies of fuel mixtures
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Multi-isotopologue laser absorption spectroscopy of carbon monoxide for high-temperature chemical kinetic studies of fuel mixtures

机译：一氧化碳的多同位素聚合激光吸收光谱技术，用于燃料混合物的高温化学动力学研究

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A laser absorption diagnostic technique, probing the mid-infrared vibrational bands of (CO)-C-12-O-16 and (CO)-C-13-O-16 near 4.9 mu m, was developed for sensitive multi-isotopologue temperature and concentration measurements in high-temperature gaseous systems. Transitions in each of the P-branches of the fundamental bands of (CO)-C-12-O-16 and (CO)-C-13-O-16 were chosen based on absorption linestrength, relative spectral isolation, and temperature sensitivity. Five total rovibrational transitions are spectrally-resolved over a similar to 1.2 cm(-1) domain using a 50 kHz triangle scan function with a distributed-feedback quantum cascade laser, yielding a 100 kHz effective measurement rate of both isotopologues and respective temperatures, independent of mixture composition. In addition, relevant broadening parameters for the P(0,22) transition of (CO)-C-13-O-16 near 2007.8767 cm(-1) were measured to enable higher time resolution (> 1 MHz) measurements using fixed-wavelength methods. Time-resolved multi-isotopologue thermometry performance was validated in a shock tube over a range of temperatures (1100-2400 K) relevant to combustion kinetics investigations. The technique is utilized in shock-heated oxidation experiments with isotopically labeled fuel mixtures, simultaneously measuring both carbon monoxide isotopologues throughout the reactions. To the authors' knowledge, these results demonstrate the first use of carbon isotope labeling with laser absorption spectroscopy to observe distinct competitive oxidation among different fuel components. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：针对敏感的多同位素温度，开发了一种激光吸收诊断技术，用于探测（CO）-C-12-O-16和（CO）-C-13-O-16的中红外振动带。高温气体系统中的浓度和浓度测量。根据吸收线强度，相对光谱隔离度和温度敏感性选择（CO）-C-12-O-16和（CO）-C-13-O-16基带的每个P支的跃迁。使用分布反馈量子级联激光器的50 kHz三角扫描功能，在类似于1.2 cm（-1）的域上对五个总的旋转振动跃迁进行光谱解析，从而获得同位素和各自温度的100 kHz有效测量速率，独立混合物组成。此外，还测量了2007.8767 cm（-1）附近（CO）-C-13-O-16的P（0,22）跃迁的相关加宽参数，以使用固定的分辨率实现更高的时间分辨率（> 1 MHz）波长方法。在与燃烧动力学研究相关的温度范围（1100-2400 K）下，在冲击管中验证了时间分辨的多同位素聚合测温性能。该技术用于同位素标记的燃料混合物的冲击加热氧化实验中，同时测量整个反应过程中的一氧化碳同位素。据作者所知，这些结果证明了首次将碳同位素标记与激光吸收光谱法结合使用来观察不同燃料组分之间明显的竞争性氧化。 （C）2019燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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