抄録
To improve combustion and exhaust gas emissions in high speed diesel engines operating with high viscosity or low grade fuels, the effects of blending low boiling point components, including paraffins and oxygenates, into the fuel were investigated.
The results indicated that a significant and simultaneous improvement of thermal efficiency, smoke and CO was obtained from the high viscosity fuel by blending with a low boiling point component. The improvement increased both with decreases in the blending component boiling point and with increases in the quantity of the blending component. Also, the improvement was obtained apparently at retarded fuel injection timings, resulting in a considerable improvement of the trade-off relation between NOx and thermal efficiency or smoke.
The cause for the improvement of thermal efficiency included an increase in the degree of constant volume combustion and combustion efficiency resulting from enhanced evaporation of the high viscosity fuel spray droplets due to blending with a low boiling point component.
