%0 Journal Article
%T Characteristics of ultrafine particles emitted from a dimethyl ether (DME) engine<br>Characteristics of ultrafine particles emitted from a dimethyl ether （DME） engine
%A LI XinLing
%A HUANG Zhen
%A WANG JiaSong
%A WU JunHua
%A <br>
%J 科学通报(英文版)
%D 2008
%I 
%X 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.
%K dimethyl ether
%K diesel engine
%K ultrafine particle
%K number concentration
%K size distribution<br>二甲基醚
%K 柴油机
%K 发动机
%K 微粒
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=7310014E3348D5E55D8B27148088713A&yid=67289AFF6305E306&vid=8E6AB9C3EBAAE921&iid=0B39A22176CE99FB&sid=8ED630AD8C61FAE8&eid=7737D2F848706113&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=20