1 option
Feasibility of Ammonia as a Spark-Ignition Engine Fuel: Strategies for Combustion Stability and Engine Efficiency Aramco Fuel Research Center Paris
- Format:
- Book
- Conference/Event
- Author/Creator:
- Karageorgiou, Dimitrios, author.
- Conference Name:
- 2025 Sustainable Energy & Powertrains (2025-11-25 : Stuttgart, Germany)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2025
- Summary:
- Ammonia (NH3) is a promising energy carrier and a potentially alternative fuel to selected sectors due to its carbon-free nature and its relatively high energy density. However, its low reactivity and slow flame propagation pose significant challenges for a direct use in an internal combustion engine, and stable operation at all engine's conditions. This study investigates three combustion strategies for utilizing NH3 in an adapted four-cylinder 2 L turbocharged, compression-ignition engine, adapted for spark-ignition (SI) operation. Initially, the engine was tested using pure ammonia as fuel, obtaining high efficiencies and acceptable stability at medium/high loads. Nevertheless, intense combustion instabilities could not be avoided below a minimum load level (which increases with engine speed), making engine operation unfeasible in approximately 30 % of its operating map. To address these limitations, two enhancement strategies are explored: Firstly, hydrogen (H2) doping pre-mixed with NH3 to enhance the fuel properties and secondly the implementation of a passive turbulent jet ignition (TJI) system, with a target to accelerate flame propagation. H2 on-board supply and storage is not part of this study and H2 could be generated through a downsized NH3 reformer of the types being currently developed for maritime and power generator applications. Experimental results indicate that the addition of small amounts of H2 (2 to 4 % in mass) significantly improves both combustion stability and thermal efficiency due to increased flame speed. These findings highlight the feasibility of NH3 as a fuel for spark-ignited engines, provided that suitable combustion enhancement techniques are implemented
- Notes:
- Vendor supplied data
- Publisher Number:
- 2025-01-0531
- Access Restriction:
- Restricted for use by site license
The Penn Libraries is committed to describing library materials using current, accurate, and responsible language. If you discover outdated or inaccurate language, please fill out this feedback form to report it and suggest alternative language.