Simulation Study on the Impact of Ethanol-Doped Reformate Gas under Lean Combustion Conditions on Combustion and Soot Emissions in Direct Injection Gasoline Engines
To address combustion and emission issues in the lean combustion of gasoline direct injection(GDI)engine,ethanol-doped reformate gas was used to enhance the engine's performance.The CONVERGE three-dimensional simulation technology was employed to explain the engine's performance at a microscopic level.The results show that introducing ethanol-doped reformate gas can improve the distribution of equivalence ratio in the cylinder,promote the generation of H radicals and OH radicals,facilitating effective combustion.With an increase in the doping ratio of reforming gas,the distribution range and concentration of HO2 and H2O2 become wider and higher,and the stratification phenomenon in the combustion chamber becomes more pronounced.As the doping ratio of reforming gas increases to 20％,the peak values of in-cylinder soot generation mass and number density are reduced by 90％and 56.25％,respectively,effectively improving the soot emissions of GDI engines.
万方数据
维普
