Multi-isotopologue laser absorption spectroscopy of carbon monoxide for high-temperature chemical kinetic studies of fuel mixtures
| Autor: | Kevin K. Schwarm, Daniel I. Pineda, R. Mitchell Spearrin, Fabio A. Bendana |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
010304 chemical physics Absorption spectroscopy General Chemical Engineering Analytical chemistry General Physics and Astronomy Energy Engineering and Power Technology 02 engineering and technology General Chemistry Rotational–vibrational spectroscopy Laser 01 natural sciences law.invention chemistry.chemical_compound Fuel Technology 020401 chemical engineering chemistry law 0103 physical sciences Isotopologue 0204 chemical engineering Shock tube Absorption (electromagnetic radiation) Quantum cascade laser Carbon monoxide |
| Zdroj: | Combustion and Flame. 207:379-390 |
| ISSN: | 0010-2180 |
| DOI: | 10.1016/j.combustflame.2019.05.030 |
| Popis: | A laser absorption diagnostic technique, probing the mid-infrared vibrational bands of 12C16O and 13C16O near 4.9 µm, 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 12C16O and 13C16O were chosen based on absorption linestrength, relative spectral isolation, and temperature sensitivity. Five total rovibrational transitions are spectrally-resolved over a ∼ 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 13C16O 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. |
| Databáze: | OpenAIRE |
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