摘要
利用微粒粒径分析仪进行测试,以研究不同理化特性的燃料对直喷式柴油机微粒排放粒度分布的影响规律,分析了柴油机微粒排放粒度分布特征。结果表明,柴油机的微粒排放大部分在1μm以下,以粒径50nm为分界,基本可以分为核态和积聚态两种。测试中微粒粒数浓度随着稀释比的增加而加大,同时微粒分布趋向核态。与转速相比,负荷变化对微粒粒度分布的影响较大,随着负荷的增大,核态PM所占比例减小。与欧Ⅲ柴油相比,生物柴油燃料核态微粒较多,积聚态微粒较少。天然气合成柴油燃料的核态和积聚态微粒浓度均低于欧Ⅲ柴油燃料,但其积聚态微粒浓度高于生物柴油燃料。
Tests are conducted by using particle size spectrometer to study the effects of fuels with different physical and chemical properties on the size distribution of particulate matter （PM） emitted from direct injection diesel engine and analyze the features of PM size distribution. The results show that the majority of diesel PM emissions have a size below 1 μm, which can basically be divided into two modes by size： nuclei mode and accumulation mode with 5Onto as the demarcation. In the test, the PM number concentration increases with the rise in dilution ratio and the particle distribugon turns towards nuclei mode. Compared with rotation speed, load change has a greater effect on PM size distribution. The proportion of nuclei mode PM reduces with the rise in load. Compared with the Euro Ⅲ diesel fuel, biomass-to-liquid （BTL） fuel has more nuclei mode PM and less accumulation mode PM. The concentrations Of both nuclei and accumulation mode PM in gas-to-liquid （GTL） fuel are lower than that in diesel fuel, while the concentration of accumulation mode PM in GTL is higher than that in BTL fuel.
出处
《汽车工程》
EI
CSCD
北大核心
2010年第7期570-574,595,共6页
Automotive Engineering
基金
国家自然科学基金项目(50876039)
吉林省科技发展计划项目(20090542)资助
