Abstract
The relationship between Bosch smoke density and the dry soot concentration in a particulate emission is examined experimentally using various test fuels including water-emulsified fuel in the wide operation range of a small-sized, high speed-turbocharged DI diesel engine. A good correlation has been confirmed between them in the combustion tests of automotive diesel oil and marine diesel oil. However, parts of the data have deviated from the above correlation curve in the cases of water-emulsified fuel and heavy fuel. The reasons for the deviation have been clearly shown by electromicroscopic studies of trapped particulates in the filter and by analyzing a relationship between the sulfur content in the fuels and the sulfate content in the dry soot.
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