In order to obtain a reduced methane combustion mechanism for predicting combustion field and pollutants accurately in CFD simulations with a lower computational cost, a reduced mechanism with 22 species and 65 steps of reactions from GRI-Mech 3.0 was obtained by direct relation graph method and sensitivity analysis. The ideal reactor calculation and VV&A (Verification, Validation, and Accreditation) in CFD were carried out using the proposed mechanism. The results showed that the proposed mechanism agrees well with the detailed mechanism in a wide range of operating conditions; the temperature field and species can be predicted accurately in CFD simulations (RANS and LES models), and the NO prediction error of an industrial gas turbine combustor outlet is less than 210 -6 . The proposed mechanism has high engineering values.

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