Further validation of an augmented reduced mechanism for methane oxidation: Comparison of global parameters and detailed structure

An augmented reduced mechanism (ARM) for methane oxidation, consisting of 1 6 species and 12 lumped reaction steps, was developed from GRI-Mech 1.2. It showed excellent performance in reproducing the global response of a wide varieties of combustion phenomena including auto-ignition, laminar flame pr opagation, and counterflowing non-premixed systems under extensive thermody namical parametric variations including those of temperature, pressure, and composition. The present study extends the rigor of validation of this red uced mechanism to the next level by showing that good reproduction still ex ists for the detailed evolutionary and spatial structures of these phenomen a. Validation comparisons have also been conducted for the two skeletal mec hanisms developed by Kazakov and Frenklach, showing that DRM-22, which cons ists of 23 species and 102 elementary steps, appears to be the minimum size for a skeletal mechanism to approach the comprehensiveness of the 12-step ARM.