Abstract
Recently, pre-mixed lean combustion has gained the attention of many researchers, who are investigating compression ignition characteristics of this type of mixture. Previous research in our laboratory has shown that low NOx combustion can be obtained by PREDIC (PREmixed lean DIesel Combustion) . While NOx emissions were very good, the PREDIC operating load limit was about half that associated with conventional diesel combustion. Supercharging was found to be effective in expanding the operating region. However, fuel consumption worsened with increasing boost pressure. This arose from increased cooling losses and a decrease in the amount of constant volume combustion(due to early ignition) . So in order to delay ignition, EGR and a lower compression ratio piston were utilized. Results showed that the lower compression ratio piston was more effective in improving the fuel consumption than EGR was. In addition, the smoke density increased with increasing boost pressure because of more fuel coming into contact with the piston surface.
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