A simulation and experimental study of the effect of hydrogen added to diesel fuel on performance and exhaust emissions in diesel engine

Diesel engines are the most trusted sources in the transportation industry. They are also widely used in the urban transportation system. Most pollutants are related to these engines. Therefore, it is important to increase the performance and reduce exhaust emissions of these engines. Alternative fuels are key to meeting upcoming targets. An experimental and numerical study was performed to investigate the effect of diesel fuel and hydrogen addition to diesel fuel from ۰ to ۳۰% on performance and exhaust emissions. Also in this research for changing diesel fuel, an indirect injection engine converted to direct injection engine. The simulation study was conducted by Star cd codes and experimental investigation was carried out on a diesel engine (Perkins ۱۱۰۳A-۳۳TG۱), three- cylinders, and four-stroke with maximum engine power ۷۲.۳hp at ۱۸۰۰ rpm. The results from this study showed that the increase of hydrogen to diesel fuel improves the thermal efficiency, resulting in lower specific fuel consumption. Also, the results showed that adding hydrogen until ۳۰%, the cylinder pressure increase by about ۹% and occurred the delay of peak pressure about ۸ degrees of a crank angle compared to diesel fuel. The other obtained results in emission with ۳۰%H۲+Diesel showed the soot emission reduced ۱۱.۳%, HC and CO reduced nearly ۳۶%, but NOx increased by about ۸.۳% due to high combustion temperature.

Keywords:

Diesel engine , hydrogen fuel , compressed ignition engine , performance , exhaust emissions