An experimental characterization of the formation of pollutants in DI diesel engines burning oxygenated synthetic fuels

Further development of the combustion system of the direct injection diesel engine is required if it is to meet the regulations scheduled for the end of the century. This study aims to investigate the role of some oxygenated synthetic fuels in a conventional technological DI diesel engine. as regards pollutant formation. The experimental technique adopted to investigate the pollutants formation is the two colors pyrometry. The experimental tests have demonstrated that the oxygen content of the fuel has a strong influence on soot formation process. Simultaneously, these fuels present very high cetane numbers, which leads to a reduction of the NO, HC and CO emissions. Aldehydes emissions are also relatively low. To confirm the main trends ohserved in the research engine, a comparison IS presented hetween regulated emissions between pentyl ether, ethylene glycol d&Me ether, and two reformulated diesel fuels of a modern four cylinders DI diesel engine for passenger car application.