Comparison study on the emission characteristics of diesel- and dimethyl ether-originated particulate matters

Experimental results show that, the number concentrations of DME and diesel engine-out PM emissions both decrease with the engine speed, and increase with engine load; the volumetric mass emission of diesel engine-out PM coincides well with its number emission. However, the volumetric mass emission of DME engine-out PM increases with engine speed and performs typical production-consumption effect with the increasing factor of Ttq⋅en. The diesel engine-out PM emission was composed on average of 84% of non-volatile fractions of soot and sulfates and 16% of soluble organic fractions (SOFs) with about 9% of which originated from diesel fuel and 6.8% from lubricant oil. Less lubricant oil originating products such as SOF and soot were emitted on DME engine than on diesel engine.