Experimental Study On Performance an‎d Emissions Of A Diesel Engine Using Ethanol an‎d Biodiesel Blended Diesel Fuels

Using biofuels is a general trend in transportation sector in many countries including Vietnam that aims to reduce both dependence on fossil fuel and environmental pollution. This paper presents the comparative experimental results of engine performance and emissions of a 4-cylinder, naturally aspirated diesel engine fueled by ethanol and biodiesel blended diesel fuels. The blends included DE5 (95% diesel-5% ethanol), DE10 (90% diesel-10% ethanol), DE5B5 (90% diesel-5% ethanol-5% biodiesel), DE10B5 (85% diesel-10% ethanol-5% biodiesel). The engine was tested at 100% of load while the engine speed varied from 1000 rpm to 3500 rpm, and at 75%, 50%, 25% of loads while keeped the engine speed constant at 3500 rpm. Results showed that the DE5 and DE10 blends caused a minor change in engine torque and fuel consumption whereas reduced quite clearly HC, CO and smoke emissions but increased NOx emissions as compared to the conventional diesel. However, blending 5% biodiesel in the DE5B5 and DE10B5 blends could help reduce a bit NOx emissions whereas the engine torque and fuel consumption nearly did not change and the other emissions in exhaust gas still significantly reduced.