Synergetic Effect of Hydrogen Supplementation in a CI Engine Fuelled with Diesel-Jatropha Biodiesel Blends on the Environmental Aspects

Abstract

Energy consumption increase is significant due to increasing population demands and expanding industrial activity, which is rapidly depleting the conventional sources of energy. This has led to a global shift towards sustainable and renewable energy sources as a means of averting an imminent energy crisis. Examples of such alternative sources include wind, solar, geothermal, hydroelectric and biofuels. In particular, biodiesel produced from biofuels can serve as a substitute to diesel because it cuts down on pollutants while maintaining comparable engine performance. This study aims at finding out how to add hydrogen to biodiesel-blended diesel engines for better performance and combustion efficiency. Optimization indicated that B20 blend was associated with the highest levels of in-cylinder pressure and energy release rates. Experiments using various flow rates of hydrogen resulted in improved combustion efficiency rate. Notably, the B20 blend doped with 7 LPM hydrogen experienced enhanced peak pressure and higher energy release rates. Moreover, the combustion efficiency increased even further when the injection timing was advanced. This was due to a longer ignition delay, which enabled more complete fuel combustion. These outcomes demonstrate that blending biodiesel with hydrogen addition and optimization of injection timing can be used to enhance diesel engine performance and minimize emissions and therefore contribute towards sustainable energy use practices. It was also noted that emission got reduced upon hydrogen addition.