文档介绍：
直接式 NTP 对柴油机 PM 热重特性及组织
形貌影响的试验研究#
韩文赫,蔡忆昔,李小华
**
5
10
(江苏大学汽车与交通工程学院,镇江 212013)
摘要:利用热重分析、扫描电镜和透射电镜等手段对一台直喷式柴油机四种工况下 PM 样品进行分析,考察
了 DNTP 处理前后样品中元素碳和可挥发物含量、表面形貌和初级粒子组织形式的变化。结果表明:随负荷
增加,原机 PM 中元素碳含量逐渐升高,形貌上依次从团簇积聚状向层片堆叠状再向多孔疏松的海绵状过渡,
初级颗粒由堆叠厚度大、分形单一的块状形态逐渐向堆叠厚度小、分形复杂的线条式积聚体形态过渡;DNTP
处理后元素碳含量升高,形貌呈现的规律与处理前相似,但在全负荷呈树杈状;初级粒子的组织形式随负
荷增加的变化并不明显,与原机全负荷时获取的 PM 样品图像相似,表明 DNTP 可有效地将 PM 中粘性较高的
VF 成分分解。
关键词: 柴油机;低温等离子体;颗粒物;热重特性;形貌
中图分类号:TK421+.5
15
Experimental Research of the Influence of DNTP on the
Thermogravimetric Characteristics and Morphology of
Diesel PM
HAN Wenhe, CAI Yixi, LI Xiaohua
20
25
30
35
40
(School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013)
Abstract: TGA, SEM and TEM were used to investigate the variation of PM properties before and
after the treatment of direct nonthermal plasma, including the content of elemental carbon and volatile
fractions, the surface morphology and the accumulation form of primary particles. The results showed
that with the increasing of load, the content of elemental carbon grew and the morphology changed
from accumulated clusters to folium piles and then to porous sponge, and the accumulation of primary
particles changed from simple fractal block with high thickness plex fractal stripes;After the
treatment of DNTP, the content of elemental carbon grew and the morphology va