Inert gas influence on the laminar burning velocity of methane-air mixtures.
Flame propagation was studied in methane-air-inert (He, Ar, N2or CO2) mixtures with various initial pressures and compositions using pressure-time records obtained in a spherical vessel with central ignition. The laminar burning velocities of CH4-air and CH4-air-inert mixtures obtained from experimental p(t) records of the early stage of combustion were compared with literature data and with those obtained from numerical modeling of 1D flames. The overall reaction orders of methane oxidation were determined from the baric coefficients of the laminar burning velocities determined from power-law equations. For all mixtures, the adiabatic flames temperatures were computed, assuming that the chemical equilibrium is reached in the flame front. The overall activation energy for the propagation stage of the combustion process was determined from the temperature dependence of the laminar burning velocity.
"Ilie Murgulescu" Institute of Physical Chemistry, 202 Spl. Independentei, Bucharest, Romania.
Maria
M
Mitu
"Ilie Murgulescu" Institute of Physical Chemistry, 202 Spl. Independentei, Bucharest, Romania.
Venera
V
Giurcan
"Ilie Murgulescu" Institute of Physical Chemistry, 202 Spl. Independentei, Bucharest, Romania. Electronic address: drazus@icf.ro.
Domnina
D
Razus
University of Bucharest, Department of Physical Chemistry, 4-12 Blvd. Elisabeta, Bucharest, Romania.
Dumitru
D
Oancea
Inert additive; Laminar burning velocity; Methane; Overall activation parameters