Effects of Hydrogen-Addition on a Bio-fueled SI Engine Performance, Fuel Consumption and Greenhouse Gas Emissions

In the current study, the hydrogen-addition influence on the performance of an SI engine using a gasoline-ethanol blend is investigated numerically. The simulation and validation of the model are carried out in order to evaluate the engine performance using conventional gasoline (G۱۰۰) and the blend of gasoline and ethanol (G۷۵E۲۵). Furthermore, the hydrogen is added to the gasoline–ethanol blend (G۵۰E۲۵H۲۵) to improve the engine thermal efficiency and reduce the amount of brake specific fuel consumption (BSFC) which leads to the reduction in greenhouse gas (GHG) emissions. The brake specific carbon dioxide (BSCO۲) is also studied in this paper. Results show that the addition of hydrogen increases the brake power and thermal efficiency, moderates the BSFC, and decreases the maximum temperature of combustion chamber which reduces the production of greenhouse gases as well as BSCO۲. In comparison with pure gasoline, by using G۵۰E۲۵H۲۵, the maximum temperature of in-cylinder gas decreased by ۱۲.۵۵%, ۱۰.۸۲%, and ۱۳.۴۳% at ۲۰۰۰, ۴۰۰۰, and ۶۰۰۰ rpm, respectively. It is also evaluated that the lowest amount of BSCO۲ is related to G۵۰E۲۵H۲۵ in most of the engine speeds. The bio-fuel of G۷۵E۲۵ and pure gasoline are placed in next positions, respectively.

کلیدواژه ها:

SI engine ، Bio-fuel ، Ethanol ، Hydrogen ، GHG Emissions