A theoretical study on hydrogen - diesel fuel dual fuelled diesel engine operation

Abstract

Alternative fuels use can improve the performance of diesel engine [1], [2], [3].The use of hydrogen to fuel diesel engine [4], [5] maybe a good solution to which can be applied for the future diesel engines of years 2030-2050, with benefits on reduction of the pollution gases and of the CO2 emission exhaust. Good combustion properties of the hydrogen define this fuel as an adequate alternative fuel for diesel engines, but special fuelling method must be assured in order to ensure the normal engine operation. The paper presents an analysis of the theoretical results obtained from in-cylinder process modelling developed for a single cylinder diesel engine fueled with diesel fuel and hydrogen at the speed of 900 rev/min. Mechanical operation of the engine for hydrogen-diesel fuelling is analysed based on pressure diagrams, heat release rate diagrams for a 20% amount of hydrogen. For hydrogen fuelling the maximum pressure variates with almost 2% and the maximum temperature with 2.3% which influence the heat release rate comparative to classic fuelling. The influences of combustion process are related with the influence of the hydrogen cyclic dose on vaporization and mixture forming processes. Dual fuelling, with hydrogen and diesel fuel, may influence the level of the pollutant emissions or CO2.