Abstract
A comparative study has been done on a diesel engine, which was equipped with high pressure common rail system. Diesel, soybean oil methyl ester and waste cooking oil methyl ester were test to analyze the influence of bio-diesel on the number and size distribution of PM emissions. The results showed that bio-diesel can significantly reduce the dry soot emission due to the containing of oxygen and the advantage of components, which results the decrease of accumulation particle emissions and total weight emissions. The size distribution of bio-diesel PM emissions becomes unimodal. The density and viscosity of bio-diesel are greater than that of diesel, which results in a significant increase of the number of nucleation particles due to the disadvantages of injection and mixture formation.
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