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    Thermal Efficiency Comparison of Different Injector Constellations in a CI Engine

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    Final_manuscript_2019-24-0172.pdf
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    Type
    Conference Paper
    Authors
    Nyrenstedt, Gustav
    Watanabe, Kazumasa
    Enya, Kenji
    Shi, Hao
    Uchida, Noboru
    Johansson, Bengt cc
    KAUST Department
    Clean Combustion Research Center
    King Abdullah Univ. of Science & Tech.
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-09-09
    Permanent link to this record
    http://hdl.handle.net/10754/660613
    
    Metadata
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    Abstract
    More stringent emission regulations call for high-efficiency engines in the heavy-duty vehicle sector. Towards this goal, reduced heat losses, as well as increased work output, are needed. In this study, a multiple injector concept to control the combustion as well as reduce the hot boundary zones is proposed. Earlier studies have proven that multiple injectors experience lower heat losses and higher efficiency. However, a comprehensive investigation of the causes for experimental heat loss was not performed in depth. Experiments in a heavy-duty CI engine equipped with three injectors were thus performed. Engine configurations of single, dual and triple injectors were compared for a single-injection case as well as a multi-injection (Sabathe-cycle) case. Heat losses, efficiency and the emission levels were quantified and investigated. Optical experiments were performed to investigate the temperature field as well as flame behavior. This led to further understanding of the heat loss drivers. Experimental data was coupled with the double compression expansion engine concept for waste heat recovery, utilizing the energy from reduced heat losses. Notable findings included an efficiency increase of 1.9 %-points when using all three injectors for a single injection. Three injectors improved the efficiency an additional 1.2 %-points in a Sabathe-cycle case as compared to a single injector case. These gains mainly followed by reduced heat losses caused by hot zones being kept away from the boundaries. Thus, the benefits of multiple injectors were proven.
    Citation
    Nyrenstedt, G., Watanabe, K., Enya, K., Shi, H., Uchida, N., & Johansson, B. (2019). Thermal Efficiency Comparison of Different Injector Constellations in a CI Engine. SAE Technical Paper Series. doi:10.4271/2019-24-0172
    Sponsors
    The authors would like to thank the N.A.C.E. consortium in Tsukuba, Japan for funding and support in terms of experimental setup. The authors would further like to thank the Clean Combustion Research Center at KAUST for support and funding.
    Publisher
    SAE International
    Conference/Event name
    SAE 14th International Conference on Engines and Vehicles, ICE 2019
    DOI
    10.4271/2019-24-0172
    Additional Links
    https://www.sae.org/content/2019-24-0172/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2019-24-0172
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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