Technical Paper
Combustion Characteristics of a Jet Ignition Ammonia-hydrogen Engine
2024-04-09
2024-01-2109
This study investigates the impact of hydrogen energy share and excess air ratio on the combustion characteristics of an ammonia-hydrogen jet ignition engine at compression ratios of 11.5 and 17.3 under 800 rpm and approximately 6 bar IMEP. The results indicate that, when passive jet ignition is used for both compression ratio conditions, a high hydrogen energy share is required to achieve stable combustion and high indicated thermal efficiency. Specifically, at the compression ratio of 11.5, a higher ammonia concentration is needed for stable combustion compared to the compression ratio of 17.3. Additionally, the range of excess air for stable combustion is narrower at the compression ratio of 17.3. The use of hydrogen as the auxiliary fuel for active jet ignition significantly reduces the overall hydrogen energy share required to achieve stable combustion.