Abstract
The higher demand for fossil fuel raises the higher pollution level in the environment and owing to the consumption and combustion process of these fossil fuels gives us a scope to find out some renewable, environmental-friendly and clean biodiesel fuel for diesel engine. In this study, the effect of B20, B40 and B100 blends of Roselle biodiesel on compression ignition engine are analysed in term of engine characteristics by varying the fuel injection pressure (180, 200, 220, 240 and 260 bars), loading (25%, 50%, 75%, 100%) and compared the result with the diesel fuel. The result showed that, the reduction in the ignition delay period, smoke emission, thermal and indicated efficiency is recorded while, brake specific fuel consumption, exhaust gas temperature, cylinder pressure, maximum rate of pressure rise, carbon dioxide and oxide of nitrogen emission increased by increasing the injection pressure. It was also recorded that at 220 bar injection pressure carbon dioxide emission increased by 1.6%, while oxide of nitrogen and smoke emission decreased by 3.18% and 2.20% for RB20 blend than that of diesel fuel. Thus, the experimental results revealed that RB20 blend gives better performance in comparison to the other tested blend of Roselle oil biodiesel, but on either side its emits higher exhaust emission.
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