Abstract
The present work investigates the engine emissions characteristics for direct injection diesel engine using coconut biodiesel, soya bean methyl ester and fish oil blends without any engine modifications. The coconut oil has three fuel samples, such as DF (100% diesel fuel), CB5 (5% coconut biodiesel and 95% DF), and CB15 (15% CB and 85% DF) respectively are used. Lower HC and CO, and higher CO2 and NOx emissions have been found for biodiesel blended fuels in comparison with the different blends of a soybean methyl ester (SME) with diesel fuel. There are two samples of SME oils such as B20 SME and B100 SME are used. The measured CO emissions of B20% SME and B100% SME were found to be 11.36% and 41.7% lower than that of diesel fuel. The various blends of fish-oil biodiesel with diesel, B25, B50, B75, B100 were used in the experiment. At full load, B100 fuel produced higher smoke, NOx, CO and HC emissions of 34.95%, 1.65%, 14.6%, and 1.8% respectively with reference to diesel fuel.
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