Abstract
In this research, problems of exhaust emission when using SVO (Straight Vegetable Oil) into DI Diesel Engine was studied in terms of sprays characteristics. In particular, influence of sac volume and injection pressure on SVO spray was examined. SVO and GO (Gas oil) spray images were taken using optical system. Later, the spray characteristics were compared with each other. From observation, SVO spray development was delayed compared to GO spray, particularly very short penetration and narrow spray angle soon after the start of injection. In addition, high fuel injection pressure at end of injection produced large size of droplets thus affects exhaust emission.
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