SUMMARY
The present investigation mainly focuses on to overcome the limitations of gasoline fumigation in diesel engine by adding up of nanofuel additives. Experiments were conducted to ascertain the engine working characteristics in a single cylinder, four stroke, multi fuel, variable compression ratio engine using (Al2O3) aluminium oxide nano additives blended diesel as a main injection fuel along with gasoline fumigation as an inducted fuel. Gasoline fumigation was achieved by controlling the electronic injector fitted at the intake manifold using open ECU software. Fuel map for gasoline fumigation was determined based on experiments with three divergent fumigation rates of 10%, 20% and 30% based on energy consumption and optimized using design of experiments. The optimization showed 10% fumigation resulted in better performance and emission characteristics and it was selected for this present investigation. Fumigation results showed decrease in brake thermal efficiency at low and medium loads; increase in brake thermal efficiency at high loads. The two different mass fractions of 25 ppm and 50 ppm Al2O3 nano liquid was blended with diesel. From the results, it was observed that Al2O3 nano additive blended diesel along with gasoline fumigation showed better performance and decreased emission characteristics. Compared to gasoline fumigation with diesel, gasoline fumigation along with 25 and 50ppm Al2O3 nanoadditives blended diesel showed that the brake thermal efficiency was enhanced about 1.95% and 3.97%, CO emission was reduced about 12.59% and 23.63%, unburned HC emission was reduced about 25.04% and 35.06%, smoke opacity was reduced about 18.74% and 31.43% maximum in-cylinder pressure was increased about 2.12% and 3.17% and cumulative heat release was increased about 0.21% and 0.92% for 25 and 50ppm Al2O3 nanoadditives blended diesel along with gasoline fumigation respectively at overall operating conditions. As the dosage level of Al2O3 increases from 25ppm to 50 ppm results in further enhancement of all working parameters except NOx emission. Finally, the addition Al2O3 nano additive was suitable solution to overcome the limitations of gasoline fumigation.