DERIVATION OF A GLOBAL CHEMICAL KINETIC MECHANISM FOR METHANE IGNITION AND COMBUSTION

A new method for the reduction of chemical kinetic detailed mechanisms is presented. It is based on atomic fluxes calculations and reaction pathways analyses. The method was applied to a CH4/O2/N2 comprehensive combustion mechanism, including NO(X) reactions, previously validated for several types of experiments (flow reactors, shock tubes, laminar flames). A global mechanism for methane combustion and NO formation h as been elaborated involving 6 chemical reactions among 10 species. Th is mechanism is able to reproduce accurately the ignition delays, temp erature profiles and concentration profiles of major species and NO ov er a wide range of experimental conditions (P = 1 atm, 60% less-than-o r-equal-to N2 less-than-or-equal-to 80%, 0.2 less-than-or-equal-to phi less-than-or-equal-to 2.2 and 900 K less-than-or-equal-to T(initial) less-than-or-equal-to 1500 K).