Double Compression-Expansion Engine (DCEE) Fueled with Hydrogen: Preliminary Computational Assessment
Hydrogen (H₂) is currently a highly attractive fuel for internal combustion engines (ICEs) owing to the prospects of potentially near-zero emissions. However, the production emissions and cost of H₂ fuel necessitate substantial improvements in ICE thermal efficiency. This work aims to investigate a potential implementation of H₂ combustion in a highly efficient double compression-expansion engine (DCEE). DICI nonpremixed H₂ combustion mode is used for its superior characteristics, as concluded in previous studies. The analysis is performed using a 1D GT-Power software package, where different variants of the DICI H₂ and diesel combustion cycles, obtained experimentally and numerically (3D CFD) are imposed in the combustion cylinder of the DCEE. The results show that the low jet momentum, free jet mixing dominated variants of the DICI H₂ combustion concept are preferred, owing to the lower heat transfer losses and relaxed requirements on the fuel injection system. Insulation of the expander and removal of the intercooling improve the engine efficiency by 1.3 and 0.5 %-points, respectively, but the latter leads to elevated temperatures in the high-pressure tank, which makes the selection of its materials harder but allows the use of cheaper oxidation catalysts. The results also show that the DCEE performance is insensitive to combustion cylinder temperatures, making it potentially suitable for other high-octane fuels, such as methane, methanol, ammonia, etc. Finally, a brake thermal efficiency of 56 % is achieved with H₂ combustion, around 1 %-point higher than with diesel. Further efficiency improvements are also possible with a fully optimized H₂ combustion system.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/2666691X
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Supplemental Notes:
- © 2022 Rafig Babayev et al. Published by Elsevier Ltd. Abstract reprinted with permission of Elsevier.
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Authors:
- Babayev, Rafig
- Andersson, Arne
- Dalmau, Albert Serra
- Im, Hong G
- Johansson, Bengt
- Publication Date: 2022-6
Language
- English
Media Info
- Media Type: Web
- Features: Appendices; Figures; References; Tables;
- Pagination: 100103
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Serial:
- Transportation Engineering
- Volume: 8
- Issue Number: 0
- Publisher: Elsevier
- ISSN: 2666-691X
- Serial URL: https://www.journals.elsevier.com/transportation-engineering/
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Publication flags:
Open Access (libre)
Subject/Index Terms
- TRT Terms: Combustion; Compression ignition engines; Hydrogen fuels; Thermal efficiency
- Subject Areas: Energy; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01837625
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 28 2022 9:40AM