Hydroxyl radical measurement in atmospheric pressure dimethyl ether-air laminar premixed flat flame using tunable diode laser absorption spectroscopy

0486044 - ÚFCH JH 2018 CZ eng C - Konferenční příspěvek (zahraniční konf.)
Nevrlý, V. - Dostál, Michal - Bitala, P. - Zelinger, Zdeněk - Suchánek, Jan - Válek, V. - Klečka, V. - Kubát, Pavel - Engst, Pavel - Vašinek, M. - Wild, J.
Hydroxyl radical measurement in atmospheric pressure dimethyl ether-air laminar premixed flat flame using tunable diode laser absorption spectroscopy.
3rd General Meeting and Workshop on SECs in Industry. Scientific Programm. Prague: J. Heyrovsky Institute of Physical Chemistry of the AS CR in Prague, 2017 - (Zelinger, Z.)
[General Meeting and Workshop on SECs in Industry /3./. Prague (CZ), 25.10.2017-27.10.2017]
Grant CEP: GA MŠMT(CZ) LTC17071; GA ČR(CZ) GA17-05167s
Grant ostatní: European Cooperation in Science & Technology(XE) CM1404
Institucionální podpora: RVO:61388955
Klíčová slova: spectroscopy * tunable diode laser absorption spectroscopy * hydroxyl
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie

Spectroscopic detection of hydroxyl (OH) radical and determination of its concentration in flames have an elusive history and considerable influence on combustion research. Electronic transitions in ultraviolet spectral region were extensively studied in this context and until recent time chemiluminescence or laser induced fluorescence of excited hydroxyl (OH*) radical is broadly used for absolute concentration and temperature measurement in flames.
However, number densities of molecular species and population of relevant quantum levels in ground electronic state can be directly estimated from intensities of absorption lines observed by probing rovibrational transitions in infrared spectral region. Application of near-infrared tunable diode laser absorption spectroscopy (NIR-TDLAS) for the given purpose was demonstrated in an earlier work of Aizawa et al. [1]. Following his pioneering studies summarized in [2], we further explored feasibility of NIR-TDLAS (especially 2f-WMS technique) for monitoring minor species within combustion experiments particularly when dealing with dimethyl ether (DME) flames. Here we report our first results of NIR-TDLAS measurements focused on hydroxyl radical detection in laminar premixed flame burning DME-air mixture under fuel-lean conditions.
Trvalý link: http://hdl.handle.net/11104/0280934