Numerical Study of Laminar Flame Propagation in CH2-N2O-N2 at Moderate Pressures and Temperatures
V. Giurcan1, M. Mitu1, C. Movileanu1, D. Razus1, D. Oancea2
1Ilie Murgulescu Institute of Physical Chemistry, 202 Spl. Independentei, Bucharest, 060021 Romania
2University of Bucharest, Department of Physical Chemistry, 4-12 Blvd. Elisabeta, Bucharest, 030018 Romania
Keywords: laminar burning velocity, methane, nitrous oxide, flame temperature, rate of heat release
Abstract
The laminar burning velocities of a stoichiometric CH4-N2O mixture diluted with N2 [30 ÷ 60 % (by volume)] at various initial pressures (1 ÷ 10 bar) and various initial temperatures (273 ÷ 423 K) are obtained by numerical modelling of their premixed adiabatic flames. The modelling is performed with the Cosilab package using the GRI-Mech 3.0 mechanism based on 53 chemical species and 325 elementary reactions. The calculated laminar burning velocities are compared with available literature data. The influence of the initial conditions (pressure, temperature, and N2 concentration) of CH4-N2O-N2 mixtures on the laminar burning velocities, maximum flame temperature, heat release rate, and peak concentrations of the main reaction intermediates is investigated and discussed. Using the correlations of the laminar burning velocities with the initial pressure and the average flame temperature, the overall activation parameters of CH4-N2O oxidation are determined.
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