The fundamental study on characteristic of palm diesel spray combustion

Abstract

The study on the characteristics of palm diesel fuel spray combustion were conducted in a constant volume combustion chamber. With the fixed experimental conditions such as ambient pressure and injection events, the effects of refined palm blending percentage with diesel and injection pressure on spray combustion and flame structure were investigated using photo diode and ICCD camera. Two-color method was employed to measure combustion flame temperature and KL factors. It was found that the higher the percentage of palm in the blend, the shorter the ignition delay and the shorter combustion period compared with diesel fuel. High temperature combustion area (over 2400 K) of palm diesel was also smaller than diesel. The amount of soot at the start of combustion was a little bit higher than diesel. The results from fuel spray image, with 80%palm blended at injection pressure 60 and 100MPa, showed that spray penetration and spray angle were shorter and smaller than diesel fuel. The effects of 10%CPO diesel at injection pressure of 100MPa on combustion and flame structure were also investigated. It was found that diesel blending with 10%CPO has shorter ignition delay and combustion period compared with conventional diesel fuel. High temperature combustion area (over 2400 K) of 10%CPO diesel was also smaller than diesel especially at the end of the combustion period. The amount of soot and soot concentration affected by this blending percentage were not significantly different from the diesel fuel.