直噴ディーゼル機関におけるスプリット噴射パターンが燃焼・排気性能に与える影響

―第2報筒内圧力と混合気特性の解析結果

抄録

Effects of split injection on combustion and emission characteristics of a D.I.Diesel engine were investigated. Keeping the injection pressure and total injection period constant, different amounts of fuel were injected between the two injection pulses. The in-cylinder pressure was analyzed and the properties of the combustion process are discussed with the engine-out measurements. The distribution of the vapor and liquid phase concentrations in the splitting fuel spray injected into a high-pressure and high-temperature vessel were measured by means of the Laser Absorption Scattering (LAS) technique. The mixture properties obtained by LAS measurements were correlated with the engine experiment. The results account for the effect of split injection on the combustion and emission characteristics.