Towards a kinetic understanding of the ignition of air-propane mixture by a non-equilibrium discharge: the decomposition mechanisms of propane
by Stéphane Pasquiers; Sabrina Bentaleb; Pascal Jeanney; Nicole Blin-Simiand; Pierre Tardiveau; Lionel Magne; Katell Gadonna; Nicolas Moreau; François Jorand
International Journal of Aerodynamics (IJAD), Vol. 3, No. 1/2/3, 2013

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.

Online publication date: Fri, 28-Feb-2014

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