Multi objective optimization of Performance and emissions Characteristics of a crdi diesel Engine fueled with sapota biodiesel ignition Enhancer blends

Abstract

Common Rail Direct Injection (CRDI) diesel engines are widely used in the transportation sectors. The modernization in the world and increasing industrialization has created a huge demand for fossil fuels. Increasing population has significantly increased the total consumption of energy. Burning petroleum-based fuels leads to the emission of toxic gases such as nitrogen oxides, smoke, etc., that are major contributor to climate change. Automotive research has noted this extremely serious problem and hence there is extensive research which is being conducted in the direction of alternative fuels. newlineBiodiesel has proven its prospective as a feasible alternative to diesel. The research outlined in this thesis uses sapota seed biodiesel. Sapota biodiesel blend and two ignition enhancers, namely, dimethyl carbonate (DMC) and n-butanol (n-B), were blended with sapota biodiesel blend and used for testing a CRDI diesel engine. The experimental results proved that the presence of oxygen content in the ignition enhancers improved the combustion process. The engine brake thermal efficiency (BTE) fuelled by a blend of B40%+DMC10% was higher than the B40%+ n-B10% blend but lower than that of pure diesel fuel. When the engine was fueled with both ignition enhancer blends, the oxides of nitrogen (NOx) emissions were higher than diesel at maximum load conditions. The B40%+DMC10% blend produced a marginal variation of 6% and 2% of NOx compared to diesel fuel and the B40%+n-B10% blend. The smoke opacity decreased sharply under B40%+n-B10% blend usage. There was a reduction of 11.76%, 19.60%, and 23.52% when fueled with diesel, B40%, and B40%+DMC10%, respectively newline