Effect of fuel composition on emission of particulates from diesel engines

It was reported in the authors' previous paper that emission of particulate s was strongly affected by aromatic properties of fuel as a result of exper iment conducted with a single-cylinder diesel engine, fueled with the pure- hydrocarbon mixed fuels, and operated in stationary condition. in this pape r, the authors investigated whether the relation could be applied to the em ission of particulates from test fuels with all the gas oil fractions and/o r a diesel-powered passenger car operated in transient conditions. The authors prepared the test fuels by mixing a low aromatic gas oil (LAO) with 2 kinds of light-cycle oils (L1, L3) or 3 kinds of pure hydrocarbons s uch as 1-methylnaphthalene, tetralin and decalin without adjusting the ceta ne number. and measured the emission of particulates from the single-cylind er diesel engine under stationary operating conditions and the diesel-power ed passenger car on 10.15 mode test procedure fueled with LAG, LAO-LI and L AO-L3. It was confirmed that the aromatic properties of the test fuels affected th e emission of particulates in both cases, similar to what was reported in t he previous paper. Four kinds of fuel parameters representing aromatic prop erty of fuel such as aromatic carbon atom content, quaternary carbon atom c ontent in aromatic rings, carbon/hydrogen (C/H) atomic ratio and I.S. index proposed bit Montagne et nl., all showed closer correlation with emission of particulates than fuel index representing aromatic content in fuels as v olume percentage. The reason why four kinds of parameters showed similar co rrelation was attributed to composition of fuel which did not contain large amounts of hydrocarbons containing tri-aromatic rings.