【作者】 杜家坤； 孙万臣； 肖森林； 谭满志； 李国良； 李建祥； 赵树发；

【Author】 Du Jiakun;Sun Wanchen;Xiao Senlin;Tan Manzhi;Li Guoliang;Li Jianxiang;Zhao Shufa;Jilin University State Key Laboratory of Automotive Simulation and Control;

【机构】 吉林大学汽车仿真与控制国家重点实验室；

【摘要】 针对再循环废气量、温度及燃油喷射参数对微粒排放粒度分布的影响进行了试验研究,分析了燃油喷射参数及废气再循环(EGR)对微粒排放粒度分布的影响规律,确定了不同喷油时刻与喷油压力下EGR率及温度对微粒排放粒度分布的影响程度及范围,揭示了不同燃油喷射参数下EGR率对微粒排放粒度分布影响的差异。研究结果表明,随EGR率增大,积聚态微粒数量浓度增加,核态微粒及总微粒数量减少。同时,随喷油时刻提前,EGR率对各模态微粒数量浓度的影响作用逐渐减弱。不同喷油压力下EGR对各模态微粒数量浓度的影响程度和范围亦存在差异,较高的喷油压力能够促进油气混合,抑制碳质颗粒的生成,可为引入大比例EGR创造良好的条件。随EGR温度升高,进气温度相应升高,各模态微粒数量浓度均有所增加。更多还原

【Abstract】 The effects of EGR and injection parameters on particle size distribution(PSD) were investigated in a common-rail direct injection engine.Tests were carried out under constant speed with variable injection parameters and EGR rates.Exhaust particle size distribution was measured under all experimental conditions.Higher EGR rates led to the reduction in nuclear mode particles and total particles number but the accumulation mode particles increase.Meanwhile,the extent of the effect of EGR rate on PSD is more significantly when later injection timing applied The extent of EGR rate on each mode particles becomes lesser with higher injection pressures which could create favorable conditions for higher EGR rate.Furthermore,all mode particles increase with the EGR temperature increasing.更多还原