University of Oulu

Fakhari, A. H., Gharehghani, A., Salahi, M. M., Mahmoudzadeh Andwari, A., Mikulski, M., Hunicz, J., & Könnö, J. (2023). Numerical investigation of ammonia-diesel fuelled engine operated in rcci mode. 2023-24–0057.

Numerical investigation of ammonia-diesel fuelled engine operated in RCCI mode

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Author: Fakhari, Amir Hossein1; Gharehghani, Ayat1; Salahi, Mohammad Mahdi2;
Organizations: 1School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
2Machine and Vehicle Design (MVD), Materials and Mechanical Engineering, University of Oulu, FI-90014 Oulu, Finland
3School of Technology and Innovation, Energy Technology, University of Vaasa, Wolffintie 34, FI-65200 Vaasa, Finland
4Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, 20-618 Lublin, Poland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Society of Automotive Engineers, 2023
Publish Date: 2024-02-28


Ammonia, which is one of the most produced inorganic chemicals worldwide, has gained significant attention in recent years as a carbon-free fuel due to its significant energy density in maritime and power plant applications. This fuel offers several advantages including low production costs and being safe for storage and transport. Reactivity controlled compression ignition (RCCI) combustion mode is considered as a promising strategy reducing the level of nitrogen oxides (NOx) emissions and particulate matters (PM) in internal combustion engines (ICEs) due to the lower combustion temperatures and charge homogeneity. Ammonia-based RCCI combustion strategy can offer a simultaneous reduction of CO₂ and NOₓ. In this study, a RCCI engine fuelled by ammonia and diesel is numerically simulated considering chemical reactions kinetics mechanism of the combustion. After validating the simulation results with literature experimental data, the effect of engine operational parameters such as the initial charge temperature together with injection timing on the engine operational characteristic including in-cylinder pressure, heat release rate (HRR), indicated mean effective pressure (IMEP) and emission levels are investigated and discussed accordingly. The results indicated that advancing the start of injection (SOI) timing from 20 to 100 CAD bTDC, increased the NOx emissions concentration at the initial intake charge temperatures of 460 and 480 K. Higher initial intake charge temperature increased the level of NOx emissions while advancing SOI timing from 20 to 100 CAD bTDC did not disturb the level of CO emission significantly.

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Series: SAE technical paper series
ISSN: 0148-7191
ISSN-L: 0148-7191
Article number: 2023-24–0057
DOI: 10.4271/2023-24-0057
Conference: International Conference on Engines & Vehicles
Type of Publication: A4 Article in conference proceedings
Field of Science: 214 Mechanical engineering
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