Abstract
The effect of biodiesel blends (derived from waste oil) on soot and particle size distribution (PSD) was investigated in a light-duty common rail direct injection diesel engine under different load conditions. The experiments included four fuels: baseline diesel (D), B40, B60, and B100. (BXX means a blend of XX vol % biodiesel in diesel). Particle size distribution in exhaust was measured by a scanning mobility particle sizer (TSI SMPS3936) through a partial dilution tunnel. The results showed that as the blend ratio increased, the filter smoke number (FSN) of biodiesel blends decreased significantly. With respect to PSD at the downstream of two diesel oxidation catalysts, an increase of engine loads led to nanoparticle formation in the nucleation mode (NM) and log-modal PSD of diesel and biodiesel blends shifts to bimodal. Biodiesel blends will significantly reduce the particle number of accumulation mode (CM) due to soot oxidation from oxygen content. However, the absence of NM was still found for B100....
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