702 高EGR率におけるディーゼル排出微粒子の低減(OS-6 ディーゼル燃焼・排ガス浄化)

概要

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To clarify optimal in-cylinder flow conditions for reducing particulate emissions under high rates of exhaust gas recirculation (EGR), an experimental study was performed in a diesel engine with high-pressure injection. The result show that the effect of swirl ratio on particulate emission appears in a different way in the case of high-EGR rate compared with no EGR case. For the injection pressure of 120MPa with a deep-bowl combustion chamber, relatively weak swirl is desirable for suppressing increase in particulate emission caused by EGR. From the comparison of NOx-PM relation between a deep-bowl and a re-entrant combustion chamber, it is elucidated that the sensitivity of particulate emission to swirl ratio depends on the shape of the combustion chamber.
社団法人日本機械学会の論文
2000-03-16