【摘要】 模拟了燃用DME的HCC I发动机的燃烧过程,研究了进气添加剂CO2和H2对其着火时刻和指示功的影响。结果表明:CO2能延迟着火时刻,降低缸内压力和温度,从而扩大HCC I燃烧运行范围;H2也可推迟着火,并能有效提高发动机的指示功。为了既控制着火始点,又提高发动机指示功,提出进气中同时添加适量CO2和H2,并就此进行了计算。更多还原

【Abstract】 With a single-zone model and chemical kinetics mechanism,the homogeneous charge compression ignition（HCCI） combustion process in a diesel engine fueled with dimethyl ether（DME） is simulated.The effect of CO₂ and H₂ as intake air additives on ignition time and indicated work is studied.The results show that CO₂ delays ignition and decreases in-cylinder pressure and temperature,which widens the operating range of HCCI engine.H₂ also delays ignition,and increases indicated work effectively as well.Finally,the proper proportions of CO₂ and H₂ added simultaneously into intake air for both controlling ignition time and raising indicated work are given with calculation.更多还原