The goal of the present
study is to develop an optimized skeletal
chemical kinetic mechanism for methane combustion, for conditions
relevant to dual-fuel marine engines. To this end, a systematic approach
is developed, consisting of the following steps: (a) assessment of
three widely used detailed mechanisms, by comparing simulation results
against three sets of indirect experimental data pertinent to methane
combustion, (b) sensitivity analysis, with identification of important
reactions (species), (c) selection of one detailed mechanism and production
of a skeletal mechanism by means of the simulation error minimization
connectivity method, (d) uncertainty analysis of the rate constants
of important reactions, and (e) optimization of the skeletal mechanism
for the rate constant parameters of the important reactions. The resulting
optimized skeletal mechanism, consisting of 28 species and 119 elementary
reactions, accurately reproduces experimental data in a wide range
of conditions and is an important development for computational fluid
dynamics studies in dual-fuel marine engines.
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