Quantification of OH and HO2 radicals during the low-temperature oxidation of hydrocarbons by Fluorescence Assay by Gas Expansion technique

Marion Blocquet (1) , Coralie Schoemaecker (1) , Damien Amedro (1) , Olivier Herbinet (2) , Frédérique Battin-Leclerc (2) , Christa Fittschen (1)

1 PC2A - Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522
2 LRGP - Laboratoire Réactions et Génie des Procédés

OH and *HO2 radicals are known to be the key species in the development of ignition. A direct measurement of these radicals under low-temperature oxidation conditions (T = 550 - 1000 K) has been achieved by coupling a technique named fluorescence assay by gas expansion, an experimental technique designed for the quantification of these radicals in the free atmosphere, to a jet-stirred reactor, an experimental device designed for the study of low-temperature combustion chemistry. Calibration allows conversion of relative fluorescence signals to absolute mole fractions. Such radical mole fraction profiles will serve as a benchmark for testing chemical models developed to improve the understanding of combustion processes.

Mots clés: HOx radicals; autoignition

Domaines: Chimie théorique et/ou physique

Marion Blocquet, Coralie Schoemaecker, Damien Amedro, Olivier Herbinet, Frédérique Battin-Leclerc, et al.. Quantification of OH and HO2 radicals during the low-temperature oxidation of hydrocarbons by Fluorescence Assay by Gas Expansion technique. Proceedings of the National Academy of Sciences of the United States of America, 2013, 110 (50), pp.20014-20017. ⟨10.1073/pnas.1314968110⟩. ⟨hal-00923973⟩