柴油机燃烧过程中基本碳粒子的生成历程

Formation Histories of Primary Carbon Particles During Diesel Engine Combustion Process

基于电控燃油喷射柴油机全气缸取样试验平台,利用场发射透射电子显微镜和图像处理技术,对柴油机燃烧过程中基本碳粒子的生成及演变历程进行了研究.结果表明,基本碳粒子的结构在柴油机燃烧过程中逐渐向石墨化过渡.燃烧初期生成的碳粒子很小,没有明显的分层;随着燃烧进程的发展,基本碳粒子逐渐长大,开始出现分层,最终形成洋葱状的微晶碳结构,且微晶结构层与层之间的距离逐渐减小.

Using the total cycling sampling system, the investigation into formation and evolution of primary carbon particles during modern diesel engine combustion process was conducted by a field emission gun transmission electron microscopy. The results were analyzed by the image technique, which showed that the structure of primary carbon particles gradually changed into that of graphite during the combustion process. At the initial combustion stage, the primary carbon particles were very small and crystal layers were not clear. With the burning process going on, primary carbon partieals began to grow and crystal layer number started to increase. Finally, primary carbon particles developed into crystallitic onion-shell carbon and the space between graphite erystallitic layer was decreased.