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Effect of Group Holes Nozzle Specification on Diesel Exhaust Emissions
Published September 28, 2005 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
In recent years, it is necessary to reduce both NOx and smoke emissions simultaneously from diesel engines. The combination of a high amount of EGR and a high injection pressure will be one of the most promising technologies to improve the tradeoff between NOx and smoke emissions, although thee is a certain limit for increasing the injection pressure. In this study, one baseline multi-holes nozzle and three different group-holes nozzle were compared to find an effect to reduce smoke emissions without increasing injection pressure further. To investigate the effects of group-holes specification on the combustion phenomena, a constant volume vessel and a bottom-viewed, single-cylinder engine were utilized with a single-cylinder engine (the same specification as the view engine). The test results showed that the group-holes nozzles, especially with a positive angle, had an effect of reducing smoke emissions at low speed and low load range.