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Characteristics of ultrafine particles emitted from a dimethyl ether (DME) engine

查看全文 作　　者：LI [1,2]XinLing;HUANG [1]Zhen;WANG [1]JiaSong;WU [1]JunHua 高影响力作者 机构地区：[1]Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, China;[2]School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China高影响力机构 出　　处：《Chinese Science Bulletin》索引2008年第53卷第2期,共9页高影响力期刊 基　　金：the National Key Technologies Research and Development Program of China (Grant No. 2003BA408B12A) 摘　　要：Measurements of exhaust particle number concentration and size distribution from a dimethyl ether (DME) engine at different engine loads and speeds were carried out by using a two-stage dilution sys- tem and an SMPS. The results of the DME engine were compared with those of the original diesel en- gine. The fuel composition had significant effects on the exhaust particle size distribution, the total exhaust particle number and mass concentrations. Compared with those of the DME engine, the parti- cle mass emissions of the diesel engine increased 5.7-17.7 times. At high engine speed (n=2200 r/min), compared with those of the DME engine, the total particle number emissions of the diesel engine in- creased 0.75-2.2 times, while the total particle number emissions of the diesel engine decreased by about 50%-80% for middle and high loads at middle engine speed (n=1400 r/min). Compared with those of the DME engine, the total exhaust particle number concentrations in the accumulation mode of the diesel engine increased 4.2-62.6 times and the exhaust particle geometric number mean diameters in the accumulation mode increased by about 10-30 nm. This correlated with higher oxygen level and lack of C-C bonds in DME. A lot of nucleation mode particles were emitted from the DME engine, this correlated with the processes of nucleation and condensation of the volatile and semi-volatile com- pounds in the exhaust gas. 关 键 词：二甲基醚 柴油机 发动机 微粒
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