Propagation Characteristics of Stoichiometric Inert-Diluted Methane-N2O Flames

In this study, the laminar burning velocities of stoichiometric methane- nitrous oxide mixtures diluted with 50 vol % single inert (inert: argon, helium, or carbon dioxide) were determined from pressure-time records obtained in a spherical vessel centrally ignited, using a correlation based on the cubic law of pressure rise. The present experimental burning velocities are compared with literature data on stoichiometric methane-nitrous oxide mixtures diluted with nitrogen and with the calculated laminar burning velocities obtained by numerical modeling of their premixed flames. The computation was performed with the COSILAB package using the GRI 3.0 mechanism. Both data sets were used for examining the influence of initial pressure (0.5-1.75 bar) of stoichiometric inert-diluted methane-nitrous oxide mixtures on laminar burning velocities, maximum flame temperatures, heat release rates, and peak concentrations of main reaction intermediates. The baric coefficients of laminar burning velocities and overall reaction orders of methane oxidation with nitrous oxide were determined.

Automated summary

This study investigates the effects of initial pressure on laminar burning velocities of diluted methane-nitrous oxide mixtures through experiments and numerical simulations, and determines the corresponding parameters.