Experimental and numerical study of a hydrogen fuelled I.C. engine fitted with the hydrogen assisted jet ignition system

The use of hydrogen as an engine fuel poses several challenges as well as opportunities in engine design and control. These challenges are mainly due to hydrogen's high flame temperatures at near stoichiometric mixtures, as well as the reactant volume fraction which can reduce the engine power output significantly. However, the wide flammability limits of hydrogen combustion in air means that a large part of the engine operation regime can be achieved without the use of the engine throttle or exhaust after treatment. This paper presents results of experiments and computations for a research single cylinder pressure boosted hydrogen fuelled internal combustion engine (H2ICE) fitted with the Hydrogen Assisted Jet Ignition system (HAJI) and running extremely lean mixtures