Title: Towards a kinetic understanding of the ignition of air-propane mixture by a non-equilibrium discharge: the decomposition mechanisms of propane

Authors: Stéphane Pasquiers; Sabrina Bentaleb; Pascal Jeanney; Nicole Blin-Simiand; Pierre Tardiveau; Lionel Magne; Katell Gadonna; Nicolas Moreau; François Jorand

Addresses: Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France. ' Laboratoire de Physique des Gaz et des Plasmas (UMR CNRS 8578), Université Paris-Sud 11, bât.210, 91405 Orsay Cedex, France

Abstract: The decomposition of propane in non-thermal plasmas of N2/C3H8 and N2/O2/C3H8 mixtures (oxygen percentage up to 20%) at low temperature is studied in a photo-triggered discharge. Quenching of nitrogen metastable states dissociate C3H8 to produce propene and hydrogen. Oxidation reactions are growing in importance when the O2 concentration increases, but the dissociation quenching reactions still occurs for the air-based mixture. Even for a low concentration of oxygen, OH is an important specie involved in the conversion of the hydrocarbon. A kinetic analysis emphasises that OH comes in great part from the production of H, in which the methyl radical plays a role, strengthening the role of the dissociation processes of propane and propene in the medium reactivity. Results of PLIF measurements performed on OH during the diffuse afterglow of a nanosecond corona discharge correlate with results obtained on the photo-triggered discharge.

Keywords: non-thermal plasma kinetics; pre-ionised discharge; corona discharge; hydrocarbon decomposition; propane; atmospheric gases; air-propane ignition; hydrogen; oxidation reactions; dissociation quenching; oxygen; methyl radical; propene.

DOI: 10.1504/IJAD.2013.050917

International Journal of Aerodynamics, 2013 Vol.3 No.1/2/3, pp.135 - 158

Published online: 28 Feb 2014 *

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