Study On The Mechanism Reduction For Kerosene Combustion And The Ignition And Extinction Combustion Characteristics

In order to obtain a simplified mechanism that can accurately predict the ignition and extinction characteristics of kerosene.In this paper,n-decane is used as surrogate formulations of kerosene.The mechanism of n-decane was selected and improved.The improved detailed mechanism was simplified by using the multi-step simplification method,a skeleton mechanism including 32 species and73 reactions and a reduced mechanism with 18 species and 14 global steps w ere developed.The combustion process of this surrogate fuel in the shock tube and perfectly stirred reactor were simulated by adopting the skeleton and reduced reaction mechanisms,and the simulated results were compared with the experimental data and detailed mechanism.The results show that both the skeletal mechanism and the 18-species reduced mechanism reproduced the ignition delay time,extinction,and species profiles of the detailed mechanism and experiment over a wide range of simulation condit ions.The skeletal mechanism and the reduced mechanism can better reflect the ignition and extinction characteristics of kerosene.At the same time,using the simplified mechanism to properly assess the influence of the contaminants on ignitio n characteristics of kerosene,it was found that the presence of H₂O or H₂O+CO₂contaminant can accelerate the ignition process.This simplified mechanism model can not only improve the coupling solving calculation efficiency of fluid mechanism equations and chemical reaction kinetics models,but also provide a solid theoretical basis for engine performance evaluation and design of advanced engine combustion chambers,and has a good prospect of eng ineering applications.