| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 95 === The specific gravity, cetane number, dynamic viscosity, and the oxgen content of biodiesel was higher than fossil premium diesel, especially in higher specific gravity and dynamic viscosity causing the injection timing advanced so that effects engine performance and the concentration of exhaust emission. In this study the diesel engine injection pressure was investigated based on B20 corn oil methyl ester blended fuel. The experimental results of diesel engine performance demonstrated that BSFC, the concentration of Smoke and HC is respectively decreased about 3.77%, 10.74% and 13.56% based on lower injection pressure than original engine but the concentration of NOx is increased about 4.69%. On the other hand, BSFC, the concentration of Smoke and HC emission is increased about 0.95%, 16.70% and 23.10%, respectively. Moreover, the concentration of NOx is decreased about 9.99%. Therefore, using higher specific gravity and dynamic viscosity of biodiesel is able to decrease fuel injection pressure properly.
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