S.M. Palash

Performance and emission analysis of a multi cylinder gasoline engine operating at different alcohol–gasoline blends

Alcohols are potential renewable alternatives for gasoline because of their bio-based origin. Although ethanol has been successfully implemented in many parts of the world, other alcohols may also be utilized, such as methanol, propanol, and butanol. These alcohols contain much energy and a high octane number. Furthermore, they displace petroleum. Therefore, this study focuses on methanol, ethanol, propanol, and butanol as gasoline fuel alternatives. We conducted tests in a four-cylinder gasoline engine under the wide open throttle condition at varying speeds and results. This engine was fueled with 20% methanol–80% gasoline (M20), 20% ethanol–80% gasoline (E20), 20% propanol–80% gasoline (P20), and 20% butanol–80% gasoline (B20). M20, E20, P20, and B20 displayed brake specific fuel consumptions levels and break thermal efficiencies that were higher than those of gasoline at 7.78%, 5.17%, 4.43%, and 1.95% and 3.6%, 2.15%, 0.7%, and 1.86%, respectively. P20 and B20 showed better torque than E20, but they consumed more fuel. Moreover, the alcohol–gasoline blends generated a higher peak in-cylinder pressure than pure gasoline. As gasoline fuel alternatives, propanol and butanol were more effective than gasoline in engines. In addition, the alcohol–gasoline blends also emitted less carbon monoxide and hydrocarbon than gasoline. However, E20 emitted more nitrogen oxide than the other alcohol–gasoline blends. Thus, propanol and butanol are more effective options than ethanol for a gasoline engine in terms of fuel properties, engine performance, and emissions.

Study on the Effect of Adiabatic Flame Temperature on NOx Formation Using Ethanol Gasoline Blend in SI Engine

Active research and development on using ethanol fuel in gasoline engine had been done for few decades since ethanol served as a potential of infinite fuel supply. This paper discussed analytically and provides data on the effects of compression ratio, equivalence ratio, inlet temperature, inlet pressure and ethanol blend in cylinder adiabatic flame temperature (AFT) and nitrogen oxide (NO) formation of a gasoline engine. Olikara and Borman routines were used to calculate the equilibrium products of combustion for ethanol gasoline blended fuel. The equilibrium values of each species were used to predict AFT and the NO formation of combustion chamber. The result shows that both adiabatic flame temperature and NO formation are lower for ethanol-gasoline blend than gasoline fuel.

Impacts of N, N'-diphenyl-1, 4-phenylenediamine (DPPD) Antioxidant Additive in Jatropha Biodiesel Blends to Reduce NOx Emission of a Multi Cylinder Vehicle Type Diesel Engine

To meet stringent exhaust emission norms worldwide, various exhaust pre-treatment and post-treatment techniques have been employed in modern engines. Using antioxidant additives in biodiesel fuels is a promising and effective NOx reduction technology. Non-edible jatropha oil based methyl ester was produced and blended with conventional diesel. Five fuel samples (Diesel, JB5, JB5DPPD0.15%, JB15 and JB15DPPD0.15%) were tested for their use as substitute fuel for a radiator-cooled four cylinder diesel engine. Experiment results show that DPPD antioxidant additive could be reduced NOx emission significantly with slight penalty on engine performance as well as CO and HC emission. However, when compared to diesel combustion the emissions of HC and CO were found nearly same or below. By addition of 0.15% (m) DPPD additive in JB5 and JB15 reduction of NOx emission were 12.68% and 13.36 % compared to biodiesel blends without additive at full throttle position. As conclusion, JB5 and JB15 with addition of 0.15% (m) can be used in four cylinder diesel engine to reduce NOx and consequently overcome the barrier to market expansion of biodiesel fuels.