Abstract:Direct Relation Graph with Error Propagation and Sensitivity Analysis (DRGEPSA) method coupled with error propagation and sensitivity analysis was used to simplify the detailed reaction mechanism of methane combustion (Gri-Mech 3.0 mechanism),and a simplified mechanism containing 23 components and 110 step elementary reactions was constructed.In order to verify the rationality and reliability of the simplified mechanism,the fully stirred reactor model and one-dimensional laminar premixed reactor model were used to simulate the combustion reaction process of methane,and the temperature and mole fraction distribution of components were compared and analyzed.The results show that the combustion temperature and component volume fraction obtained by the simplified mechanism analysis are in good agreement with the detailed mechanism prediction data.Combined with the simplified chemical reaction mechanism,a two-dimensional numerical model is established to verify the numerical simulation of methane/air diffusion combustion (Flame D) with accompanying flow.The temperature and component distribution of the flow field are in good agreement with the experimental data,which further shows that the simplified mechanism of methane combustion obtained in this paper has high simulation accuracy and is suitable for numerical simulation of methane combustion.