柴油机燃烧形成微粒的形态特性及微量元素分析

Analysis on Morphology and Micro-Element of Particulates in Diesel Engine Combustion

基于电控燃油喷射柴油机的全气缸取样系统,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形成微粒的形态特性和微量元素进行了分析。结果表明,柴油机燃烧过程中形成的微粒主要呈现两种形态:一种是由基本碳粒子凝结而成的典型微粒;另一种是富含金属和非金属元素的无定形微粒。其中金属元素主要来源于润滑机油,贯穿整个燃烧过程,且独立存在。另外,典型微粒具有分形结构特性,分维数介于1.2~1.74,且在扩散燃烧初期有降低的趋势。

Using the total cylinder sampling system,the investigation on the morphology and micro-element of particulates from a electronically controlled diesel engine were conducted by a field emission gun transmission electron microscopy(FEG TEM),and the results were analyzed by the image technique.The results show that the particulates during combustion process present two morphologies: one is the representative particulate which formed through agglomeration of small sphere-like primary carbon particles;and the ot...