Abstract
Many reports, related to the effects of fuel properties on exhaust emissions in DI diesel engines, have been published. It is reported that decreasing of high boiling point fraction, aromatic hydrocarbon and sulfur contents in fuel are effective to reduce PM emissions. However, the effectiveness of these properties differs from researcher to researcher, may be due to the difference in engine specifications. Especially in small DI diesel engines, the fuel properties have significant influence on PM emissions, since much fuel impinges on the combustion chamber walls. To clarify the effect of fuel properties on PM emission in a small DI diesel engine, we investigated the changes of emission characteristics using some paraffinic hydrocarbon fuels with different boiling point. Moreover, the changes in exhaust emissions by the addition of aromatic hydrocarbon to paraffinic, naphthenic and diesel fuel were investigated. The results showed that the amount of SOF when using low boiling point paraffinic fuels decreases to about one tenth of that of diese1 fuel. Blending of the aromatic hydrocarbon with the base fuel of diesel or olefin causes increased amount of SOF emission, but there is no change when the base fuel is para ffin. However, the dry Soot is increased regardless of the base fuel when blending the aromatic hydrocarbon.
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