EGR对二级增压高压共轨柴油机燃烧及排放的影响  

Effects of EGR on Combustion and Emission Characteristics for Two-stage Turbocharged High-pressure Common Rail Diesel Engine

作　　者：朱睿[1] 孙万臣[1] 杜家坤[1] 李鲁宁[1] 李国良[1] 李文祥 

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,吉林长春130025 [2]中国第一汽车股份有限公司技术中心,吉林长春130011

出　　处：《车用发动机》2014年第4期73-77,88,共6页Vehicle Engine

摘　　要：针对某电控高压共轨重型柴油机,研究了二级增压及EGR系统对燃烧、排放及动力性能的影响规律。研究结果表明,相同EGR率下,二级增压柴油机CO,HC和炭烟排放均低于单级增压,且随EGR率增大,缸内燃烧压力、放热率峰值及缸内平均温度均有所降低,滞燃期变化不大。相比单级增压,二级增压能够实现更大的EGR率,在更宽的EGR率范围内保持发动机良好的动力性和经济性;随EGR率增大,EGR对二级增压柴油机NOx排放的抑制效果更为明显,且能够在更宽的EGR率范围内维持较低的炭烟排放;NOx与燃油消耗率和烟度的平衡关系也明显优于单级增压。The effect of EGR and two-stage turbocharging on combustion ,emission and power performance was investigated on a electronic control high-pressure common rail heavy duty engine .The result shows that the CO ,HC and soot emissions of two-stage turbocharged diesel engine are lower than the original under the same EGR rate .With the increase of EGR rate ,the maximum in-cylinder pressure ,the peak heat release rate and the in-cylinder average combustion temperature decrease and the ignition delay period almost keeps unchanged .Compared with the original engine ,two-stage turbocharged engine can achieve the higher EGR rate and can keep good power and economy performance in a wider range of EGR rate .With the increase of EGR rate ,the inhibition NOx emissions become more obvious and the lower soot emissions can be maintained in a wide range of EGR rate .The compromise between NOx emission and fuel consumption rate as well as soot emission is also significantly better than the single-stage turbocharged engine .

关 键 词：高压共轨 重型柴油机 二级增压 废气再循环 燃烧 排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]