ディーゼル機関のEGR燃焼場における高乱流の効果

概要

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High turbulence combustion is effective to reduce paniculate emissions from a DI diesel engine. This study employed EGR for the chamber to obtain further NOx reduction. Results show that, when EGR ratio increases for the chamber, NOx is reduced with less deterioration of particulate emissions than a standard toroidal chamber. CO_2 gas, which is one of main components of EGR gas, reduces gas temperature, leading to low NOx emission. In the case of CO_2 dilution of intake air, both NOx and particulate emissions are reduced compared with generally EGR or N_2 dilution. CO_2 dilution restrains initial combustion due to lower gas temperature just after ignition, which promotes fuel-air mixing at early stage of initial combustion. Promoted mixing reduces the formation of rich and high temperature mixture, resulting in lower soot generation. Air charge raises gas temperature and makes CO_2 dilution effective in the wider range of dilution ratio.
社団法人日本機械学会の論文
2004-09-04