In this study, experiments were carried out to investigate the effects of fuel properties such as cetane number, aromatic content on NO, THC, smoke and particulate emissions of a DI diesel engine. Cetane number and aromatic content of the fuels were varied independently to separate their effects on emissions. The results showed that for the fuels with the same aromatic content, reducing cetane number resulted in the decrease of particulate emission and the increase of NO emission. As cetane number was kept constant, changing the aromatic content had little effect on combustion characteristics. However, increasing aromatic content resulted in higher particulate and NO emissions. At retarded injection timing, for the low cetane number fuels, THC increased dramatically at low load due to the overleaning caused by long ignition delay. In particular, for the low cetane number fuel with aromatic content, not only THC but also SOF increased at low load. As the injection pressure was raised, NO increased and particulate decreased for all fuels tested, and also particulate emission became less sensitive to fuel properties.
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