INVESTIGATION OF FUEL INJECTION PRESSURE IMPACT ON CI ENGINE PERFORMANCE AND EMISSIONS USING BIODIESEL BLEND WITH ALUMINA NANO ADDITIVES

Performance and exhaust emission characteristics of direct injection, four stroke, water cooled, single cylinder diesel engine was investigated using alumina nano particles as additives with Mahua biodiesel blend B25 (75% Diesel + 25% Mahua biodiesel) at various fuel injection pressures. Experiments were carried out on the engine at constant speed by changing injection pressures from 200 bar to 220 bar and then to 240 bar at different load conditions and the results were analyzed. Biodiesel blends with the addition of nanoparticles were prepared with the help of an ultra sonicator and the Alumina nanoparticles were added in the proportion of 100ppm by mass fraction. From the tests results, it was observed that injecting fuel at 240 bar with nano additives blend given better results of performance and emissions compared to the other two pressures and with plain diesel at 200bar. At 240 bar, 12% thermal efficiency was increased for B25100Al2O3 and 7.8% BSFC was reduced when compared to diesel at 200bar. With biodiesel blend, B25100Al2O3 at 240 bar injection pressure, emissions such as CO (%), HC (ppm) and Smoke opacity (%) were decreased by 25%, 29.4%, 24.48% respectively and NOX (ppm) emissions was increased by 9.36% when compared to diesel at 200 bar