Combustion Process Analysis of Secondary Jet-Guided Combustion in Hydrogen Direct-Injection Engines
Source abstract
Abstract
This study investigates the effects of secondary jet-guided combustion on the combustion and emissions of a hydrogen direct-injection engine through numerical simulations. The results show that secondary jet-guided combustion, which involves injecting and igniting the hydrogen jet at the end of the compression stroke, significantly shortens the delay period, improves combustion stability, and brings the combustion center closer to the top dead center (TDC), achieving a maximum indicative thermal efficiency (ITE) of 46.55% (λ = 2.4). However, this strategy results in higher NOx emissions due to high-temperature combustion. In contrast, single and double injections lead to worsened combustion and reduced thermal efficiency under lean-burn conditions, but with relatively lower NOx emissions. This study demonstrates that secondary jet-guided combustion can effectively enhance hydrogen engine performance by optimizing mixture stratification and flame propagation, providing theoretical support for clean and efficient combustion.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Combustion Engine Technologies · Combustion and flame dynamics · Heat transfer and supercritical fluids
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
Funding
Scientific and Technological Project of Yunnan Precious Metals Laboratory
References (23)
Show source-provided references
1. Towards sustainable hydrogen and ammonia internal combustion engines: Challenges and opportunities10.1016/j.fuel.2024.131090 ↗
2. Recent progress in the use of hydrogen as a fuel for internal combustion engines10.1016/j.ijhydene.2013.10.102 ↗
3. A comprehensive review on the utilization of hydrogen in low temperature combustion strategies: Combustion, performance and emission attributes10.1016/j.joei.2023.101511 ↗
4. Prospectus of hydrogen enrichment in internal combustion engines: Methodological insights on its production, injection, properties, performance and emissions10.1016/j.fuel.2024.131034 ↗
5. Study of single and split injection strategies on combustion and emissions of hydrogen DISI engine10.1016/j.ijhydene.2023.10.060 ↗
6. Hydrogen engine operation strategies: Recent progress, industrialization challenges, and perspectives10.1016/j.ijhydene.2022.09.256 ↗
7. High-pressure injection or low-pressure injection for a direct injection hydrogen engine?10.1016/j.ijhydene.2024.02.018 ↗
8. Effects of hydrogen injection timing and injection pressure on mixture formation and combustion characteristics of a hydrogen direct injection engine10.1016/j.fuel.2024.130966 ↗
9. Effects of split injection proportion and the second injection timings on the combustion and emissions of a dual fuel SI engine with split hydrogen direct injection10.1016/j.ijhydene.2019.02.222 ↗
10. Understanding hydrogen jet dynamics for direct injection hydrogen engines10.1177/14680874231169562 ↗
11. Progressive split injection strategies to combustion and emissions improvement of a heavy-duty diesel engine with ammonia enrichment10.1016/j.energy.2025.134660 ↗
12. Comparison of diesel single/double/triple injection strategies and early/late compression ignition regimes in an ammonia/diesel dual-fuel engine10.1016/j.energy.2025.135753 ↗
13. Effect of injection strategy optimization on PCCI combustion and emissions under engine speed extension in a heavy-duty diesel engine10.1016/j.fuel.2022.126053 ↗
14. Spark-Ignition and Combustion Characteristics of High-Pressure Hydrogen and Natural-Gas Intermittent Jets10.1115/1.2938271 ↗
15. Hydrogen direct injection: Optical investigation of premixed and jet-guided combustion modes10.1016/j.ijhydene.2024.02.278 ↗
16. Optical and thermodynamic investigation of jet-guided spark ignited hydrogen combustion10.1016/j.ijhydene.2024.06.221 ↗
17. Ali, M.F.M. (2011). Improvement of Combustion of CNG Engine Using CNG Direct Injection and Gas-Jet Ignition Method, SAE International.
18. Ammonia-hydrogen combination engine with injecting jet ignition (IJI): The concepts and ignition mechanism10.1016/j.fuel.2025.135977 ↗
19. Numerical research on effect of hydrogen blending fractions on idling performance of an n-butanol ignition engine with hydrogen direct injection10.1016/j.fuel.2019.116082 ↗
20. Improvement of H2/O2 chemical kinetic mechanism for high pressure combustion10.1016/j.ijhydene.2020.11.083 ↗
21. Turbulence modeling of internal combustion engines using RNG k-epsilon models10.1080/00102209508907782 ↗
22. Krastev, V., Silvestri, L., and Falcucci, G. (2017). A Modified Version of the RNG k–ε Turbulence Model for the Scale-Resolving Simulation of Internal Combustion Engines. Energies, 10.10.3390/en10122116 ↗
23. Effects of direct water injection on engine performance in engine fueled with hydrogen at varied excess air ratios and spark timing10.1016/j.fuel.2020.117209 ↗