柴油微尺度燃烧模型构建及燃烧特性影响规律研究

Study on the Micro-Scale Combustion Model and Influences of Parameters on Combustion Characteristics

基于CONVERGE三维计算平台构建了耦合柴油化学反应动力学的微尺度燃烧模型,分别研究了初始环境压力、初始环境温度和狭缝间距对燃烧特性的影响。结果表明:初始环境压力越大,初始环境温度越小,狭缝间距越大,瞬时放热率峰值越高且对应时刻越早,最高燃烧温度越高。燃烧前近稳态压力决定是否可以实现微尺度燃烧,燃烧前近稳态压力高于0.69 MPa时方可实现燃烧。

Based on the 3D computing platform CONVERGE,a micro-scale combustion model coupling the chemical reaction kinetics of diesel was proposed.And the effects of initial ambient pressures,initial ambient temperatures and slit spacing on the combustion process were studied.Results show that higher ambient pressure,smaller initial ambient temperature,and larger slit spacing leads to greater and earlier peak value of instantaneous heat release rate as well as higher maximum combustion temperature.Besides,the near steady state pressure before combustion determines the occurrence of micro-scale combustion.The micro-scale combustion happens when the near steady state pressure is higher than 0.69 MPa.