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    Isobaric Combustion for High Efficiency in an Optical Diesel Engine

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    Final_Manuscript_Nyrenstedt_2020-01-0301.pdf
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    Description:
    Accepted Manuscript
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    Type
    Conference Paper
    Authors
    Nyrenstedt, Gustav cc
    AlRamadan, Abdullah
    Tang, Qinglong cc
    Badra, Jihad
    Cenker, Emre
    Ben Houidi, Moez cc
    Johansson, Bengt cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-04-14
    Embargo End Date
    2020-10-14
    Submitted Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/661310
    
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    Abstract
    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:10.4271/2020-01-0301
    Sponsors
    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 International
    Conference/Event name
    SAE 2020 World Congress Experience, WCX 2020
    DOI
    10.4271/2020-01-0301
    Additional Links
    https://www.sae.org/content/2020-01-0301/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2020-01-0301
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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