Investigation on the Effects of Geometrical Specifications of Injection on Performance of a Direct Injection Hydrogen Fueled Engine

Hydrogen is a specified issue among alternative fuels named for reducing carbon dioxide in exhaust gas. Hydrogen can be injected into runner or directly within the combustion chamber. However direct injection would be desired because it would reduce the risk of pre-ignition and backfiring besides recovering volumetric efficiency losses. Injection parameters play a significant role in direct injection engines. In this paper, a direct injection hydrogen fueled engine is simulated via AVL-Fire commercial software and the results are validated with experimental data from reference works. The effects of injection pressure, injector angle and spark plug position have been investigated. Results showed that increasing injection pressure would improve engine performance with increase in nitrogen oxide pollutant. Tilting the injector toward spark plug would make a rich zone near spark thus better combustion process. The study was continued focusing on spark plug position and selecting the best position due to charge stratification.