19-Species Reduced Mechanism for CH4 Oxidation

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Based on the work:

"A criterion based on computational singular perturbationfor the identification of quasi steady state species:A reduced mechanism for methane oxidationwith NO chemistry" by Tianfeng Lu, Chung K. Law, Combustion and Flame, Vol. 154, pp 761-774 (2008)

Abstract:

A criterion based on computational singular perturbation (CSP) is proposed to effectively distinguish the quasisteady state (QSS) species from the fast species induced by reactions in partial equilibrium. Together with themethod of directed relation graph (DRG), it was applied to the reduction of GRI-Mech 3.0 for methane oxidation,leading to the development of a 19-species reduced mechanism with 15 lumped steps, with the concentrationsof the QSS species solved analytically for maximum computational efficiency. Compared to the 12-step and 16-species augmented reduced mechanism (ARM) previously developed by Sung, Law & Chen, three species, namelyO, CH3OH, and CH2CO, are now excluded from the QSS species list. The reduced mechanism was validatedwith a variety of phenomena including perfectly stirred reactors, auto-ignition, and premixed and non-premixedflames, with the worst-case error being less than 10% over a wide range of parameters. This mechanism wasthen supplemented with the reactions involving NO formation, followed by validations in both homogeneous anddiffusive systems.