高速ディーゼル機関における燃焼音とNOxへのセタン指数の影響

抄録

The increasing rate of engine sound and vibration is a grave problem on the coastal fishing boats. The acoustic characteristics of sound emission were studied with respect to the cetane Indices of fuel using a single cylinder diesel engine. At the same time, NOx emission was evaluated to cetane index correlation. Consequently, levels of combustion sound and NOx emission were increased appreciably at cetane Indexs below 45. These are due largely to the high rate of combustion pressure rise just when the violent pre-mixed combustion caused by long ignition delay occurred.