Isobaric Combustion for High Efficiency in an Optical Diesel Engine
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Type
Conference PaperAuthors
Nyrenstedt, Gustav
AlRamadan, Abdullah
Tang, Qinglong

Badra, Jihad
Cenker, Emre
Ben Houidi, Moez

Johansson, Bengt

KAUST Department
Clean Combustion Research CenterMechanical Engineering
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2020-04-14Embargo End Date
2020-10-14Submitted Date
2019Permanent link to this record
http://hdl.handle.net/10754/661310
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Show full item recordAbstract
Isobaric combustion has been proven a promising strategy for high efficiency as well as low nitrogen oxides emissions, particularly in heavy-duty Diesel engines. Previous single-cylinder research engine experiments have, however, shown high soot levels when operating isobaric combustion. The combustion itself and the emissions formation with this combustion mode are not well understood due to the complexity of multiple injections strategy. Therefore, experiments with an equivalent heavy-duty Diesel optical engine were performed in this study. Three different cases were compared, an isochoric heat release case and two isobaric heat release cases. One of the isobaric cases was boosted to reach the maximum in-cylinder pressure of the isochoric one. The second isobaric case kept the same boost levels as the isochoric case. Results showed that in the isobaric cases, liquid fuel was injected into burning gases. This resulted in shorter ignition delays and thus a poor mixing level. The lack of fuel/air mixing was clearly the main contributor to the high soot emissions observed in isobaric combustion. The lower heat losses of the isobaric strategy were further explained by tracking the chemiluminescence. Unlike a long single injection, multiple injections helped to contain the hot gases away from the walls. However, the opposite effects were also found from the high thermal radiation caused by the extensive soot formation. High-pressure fluctuations from the rapid heat release of the isochoric case were further seen. Finally, better mixing for improved air utilization was deemed needed when utilizing isobaric heat release.Citation
Nyrenstedt, G., Al Ramadan, A., Tang, Q., Badra, J., Cenker, E., Ben Houidi, M., & Johansson, B. (2020). Isobaric Combustion for High Efficiency in an Optical Diesel Engine. SAE Technical Paper Series. doi:10.4271/2020-01-0301Sponsors
The paper is based upon work supported by Saudi Aramco Research and Development Center FUELCOM3 program under Master Research Agreement Number 6600024505/01. FUELCOM (Fuel Combustion for Advanced Engines) is a collaborative research undertaking between Saudi Aramco and KAUST intended to address the fundamental aspects of hydrocarbon fuel combustion in engines, and develop fuel/engine design tools suitable for advanced combustion modes. Furthermore, the authors would like to thank Arne Andersson at Volvo AB for his valuable inputs. Finally, the authors would like to thank MESA Engine Solutions for their cooperation and valuable input for our engines.Publisher
SAE InternationalConference/Event name
SAE 2020 World Congress Experience, WCX 2020Additional Links
https://www.sae.org/content/2020-01-0301/ae974a485f413a2113503eed53cd6c53
10.4271/2020-01-0301