Investigation on the performance and emission characteristics and influence of antioxidant on nitrous oxide emission in DI CI engine fueled by optimum papaya biodiesel blend

Abstract

Second generation biofuels are said to be compatible alternatives of conventional fuels due to their renewability and better combustion. Though higher proportion of biodiesel blends result in relatively less tail emissions when compared with their lower proportion blends and convention fuel, they resulted in poor performance. In the present investigation at the initial phase the blend B25 of papaya biodiesel, which is often identified as optimum in earlier investigation is employed to run a 5.2 kW DI CI engine at varying load levels. The seeds of papaya are cost effective feedstock for the production of biodiesel and the seeds contain about 35% of oil. Inspite of several advantages, in general biodiesel blends result in higher NO_X emission than the conventional fuel. The result outcomes revealed that, at full load the optimum blend performed better comprising brake specific fuel consumption of 0.280 kg/kWh and brake thermal efficiency of 31.44% along with enhanced NO_X emission ranging 988 ppm. In the later phase of investigation, Para-Phenylendiamine (PPDA), an antioxidant is employed in varying proportion to reduce the NO_X emission level and it is suggested that the proportion 0 mg is found optimum n reducing the respective emission.