The Effect of Injection Strategy on the Mixture Formation and Combustion in a Direct Injection Hydrogen Engine

In this study, the effect of injection strategy on the mixture formation and combustion in a hydrogen direct injection engine using CFD analysis was investigated. Four Start of Injection timings and three types of injection rate were used to understand how the fuel and air mixing process and fuel distribution at the spark timing affect the start of combustion and flame propagation. The results shows that injection timing and rate shape significantly influence the formation of the fuel-air mixture and the subsequent combustion process. Uneven mixture formations from direct injection necessitate careful consideration of local equivalence ratios around the spark plug to ensure efficient combustion initiation and flame propagation.