在一台电控共轨光学发动机上,采用高速摄影法,对不同掺混比例的乙醇柴油混合燃料进行研究,获取了缸内燃烧火焰图像,通过双色法得到表征碳烟总体分布的KL因子,分析了乙醇这种含氧生物质燃料对缸内燃烧过程和碳烟生成特性的影响。研究结果表明,随着乙醇掺入比例的增加,滞燃期相对延长,燃烧持续期缩短,火焰的亮度和分布面积都随之下降。KL因子的最高浓度降低,碳烟浓区的分布区域减小,碳烟的氧化进程加快。 In an electronically controlled common-rail optical engine, the high-speed photography method was used to study the mixture ratio of ethanol and diesel fuel, the in-cylinder combustion flame image was obtained, and the KL factor characterizing the overall distribution of soot was obtained by two- The effect of ethanol, an oxygenated biomass fuel, on in-cylinder combustion and soot formation characteristics was analyzed. The results show that with the increase of the proportion of ethanol, the retardation period is relatively prolonged and the duration of combustion is shortened, the brightness and distribution area of ​​the flame decrease. The highest concentration of KL decreased, the distribution of soot concentration decreased, and the oxidation of soot accelerated.