Optimization of hydrogen combustion engines: a simulation study

This study focuses on the development and analysis of a four-stroke, direct-injection hydrogen internal combustion engine using the CONVERGE CFD software. The research refines the hydrogen-oxygen combustion mechanism by adjusting key kinetic parameters from the GRI 3.0 methane mechanism for enhanced accuracy. Detailed simulations investigate the effects of piston geometry, fuel injection timing, ignition energy, and timing on the engine's performance. Additionally, the study explores the impact of increased expansion ratios in conjunction with the Miller cycle on thermal efficiency. Results are validated through error analysis and grid independence checks, providing significant insights into optimizing hydrogen engines for improved efficiency and reduced emissions. These findings contribute to the advancement of sustainable hydrogen-fueled automotive technologies.