高過給圧縮着火機関における希薄予混合燃焼の基本特性

概要

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Recently, pre-mixed lean mixture combustion has attracted attention, and many researchers are investigating compression ignition of a pre-mixed lean mixture. Previous research in our laboratory has shown that low NO_x emission combustion is obtained by PREDIC (PREmixed lean DIese1 Combustion). However some problems still remain, such as higher fuel consumption, a lack of ignition timing control, a large increase in THC and CO, compared to conventional diesel combustion. The output limit of PREDIC is about 50% of conventional diesel combustion. So in order to increase the PREDIC engine output, supercharging was adopted. It was resulted that the power output was higher and the fuel consumption was better than the conventional natural aspiration diesel engine using supercharging. The numerical simulation analysis shows that NO_x was produced at rich mixture area because of lower spray penetration under high density conditions. As the result, the high injection rate is effective to make a lean mixture.
一般社団法人日本機械学会の論文
2000-09-25