以某高压共轨柴油机为样机,结合AVL 513D可视化研究系统,搭建柴油机缸内工作过程可视化研究平台,进行EGR对高压共轨柴油机燃烧过程影响的可视化研究。研究表明:通过所搭建的柴油机缸内工作过程可视化平台可以直观地分析柴油机缸内燃烧过程,为合理组织缸内燃烧过程提供依据。小负荷条件下,EGR率的增加(≤30%)可以有效地缩短着火延迟期,缸内氧浓度不断降低,燃烧火焰平均温度下降,高温强辐射区域的比例也减小,导致柴油机缸内燃烧持续期延长,缸内火焰熄灭的时刻推后。 Taking a high pressure common rail diesel engine as a prototype and a visual research system of AVL 513D, a visualization research platform of diesel engine in-cylinder working process was set up and a visual study of EGR on the combustion process of high pressure common-rail diesel engine was carried out. The research shows that through the visualization platform of built-in diesel engine in-cylinder working process, it can intuitively analyze the combustion process in diesel cylinder and provide the basis for reasonable organization of in-cylinder combustion process. Under the condition of small load, the increase of EGR rate (≤30%) can shorten the ignition delay effectively, the oxygen concentration in cylinder decreases continuously, the average temperature of combustion flame decreases, and the ratio of high temperature and strong radiation area also decreases, resulting in the combustion of diesel engine cylinder Extended duration, the moment of flame extinguished cylinder pushed back.