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Dynamics of excited hydroxyl radicals in hydrogen-based mixtures behind reflected shock waves

Mével, R. and Pichon, S. and Catoire, L. and Chaumeix, N. and Paillard, C. -E. and Shepherd, J. E. (2013) Dynamics of excited hydroxyl radicals in hydrogen-based mixtures behind reflected shock waves. Proceedings of the Combustion Institute, 34 (1). pp. 677-684. ISSN 1540-7489. doi:10.1016/j.proci.2012.06.151.

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The chemiluminescence originating from OH∗, the excited hydroxyl radical, is one of the most extensively used diagnostics to characterize auto-ignition delay time of gaseous mixtures behind reflected shock waves. We have carried out new experiments and modeling of this diagnostic as well as analyzed previous results for hydrogen-based mixtures, including H_2–O_2, H_2O_2–H_(2)O, H_2–N_(2)O and H_2–O_2–N_(2)O. The experiments were analyzed with a detailed chemical reaction model which included mechanisms for OH∗ creation, quenching and emission. Simulations of the reaction behind reflected shock waves were used to predict OH∗ emission profiles and compare this with measured results as well as profiles of temperature and the ground state concentrations of OH. Analysis of OH∗ rates of progress demonstrates that a quasi-steady state approximation is applicable and an algebraic model for OH∗ concentrations can be derived that relates emission to the product of concentrations of O and H for H_2–O_2 and H_(2)O_2 mixtures and an additional contribution by the product of H and N_(2)O when N_(2)O is an oxidizer.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mével, R.0000-0002-0032-350X
Shepherd, J. E.0000-0003-3181-9310
Additional Information:© 2012 The Combustion Institute. Published by Elsevier Inc. Available online 21 July 2012. The authors acknowledge Aurélien Demenay, Université d’Orléans, and Jason Damazo, Caltech, for their help in setting-up the shock-tube at the Explosion Dynamics Laboratory at Caltech.
Subject Keywords:Excited hydroxyl radical; Reflected shock wave; Hydrogen; High temperature chemical kinetics
Issue or Number:1
Record Number:CaltechAUTHORS:20130131-095240660
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Official Citation:R. Mével, S. Pichon, L. Catoire, N. Chaumeix, C.-E. Paillard, J.E. Shepherd, Dynamics of excited hydroxyl radicals in hydrogen-based mixtures behind reflected shock waves, Proceedings of the Combustion Institute, Volume 34, Issue 1, 2013, Pages 677-684, ISSN 1540-7489, 10.1016/j.proci.2012.06.151.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36707
Deposited On:31 Jan 2013 21:39
Last Modified:09 Nov 2021 23:24

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