| A traditional full-dilution tunnel system was enhanced to allow more detailed assessment of the individual chemical components of the diesel particulate matter (PM) from a diesel engine. With this system, an experiment was performed to investigate the effects of engine operating conditions and fuel composition on combustion, gaseous emissions, and detailed chemical composition and size distributions of PM.; The chemical composition and size distributions of PM were highly dependent on the engine operating conditions and fuel composition. There was a dramatic shift in the ratio of EC to OC and in the sulfates and trace metals when the engine was traversed across a load and speed range. Mass loading, EC, and sulfates were significantly lowered with advanced diesel fuels, particularly for high load conditions.; The advanced fuels produced more nuclei-mode particles and less accumulation-mode particles than the LSD fuel for high load conditions. In contrast, the former produced less nuclei-mode particles and more accumulation-mode particles than the latter for medium load conditions. Advanced injection timing induced more intense combustion, resulting in higher concentrations of fine nuclei-mode particles. |
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