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International Journal of Automotive Technology > Volume 26(1); 2025 > Article
International Journal of Automotive Technology 2025;26(1): 73-82.
doi: https://doi.org/10.1007/s12239-024-00151-2
The Effect of Injection Strategy on the Mixture Formation and Combustion in a Direct Injection Hydrogen Engine
Wonah Park
Department of Mechanical and Automotive Engineering, Kyungsung University, Busan 48434, Republic of Korea
PDF Links Corresponding Author.  Wonah Park , Email. wpark@ks.ac.kr
Received: June 27, 2024; Revised: August 5, 2024   Accepted: August 21, 2024.  Published online: September 24, 2024.
ABSTRACT
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.
Key Words: Hydrogen · Hydrogen engine · Direct injection · Spark ignition · Computational fluid dynamics (CFD)

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