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    Study of Fuel Octane Sensitivity Effects on Gasoline Partially Premixed Combustion Using Optical Diagnostics

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    Name:
    Study of fuel octane sensitivity effects on gasoline partially premixed combustion using optical diagnostics.pdf
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    2.706Mb
    Format:
    PDF
    Description:
    Accepted manuscript
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    Type
    Conference Paper
    Authors
    Shi, Hao
    An, Yanzhao cc
    Johansson, Bengt cc
    KAUST Department
    Mechanical Engineering Program
    Clean Combustion Research Center
    Physical Science and Engineering (PSE) Division
    Date
    2020-02-25
    Embargo End Date
    2020-08-25
    Permanent link to this record
    http://hdl.handle.net/10754/663830
    
    Metadata
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    Abstract
    Partially premixed combustion (PPC) is a low-temperature combustion concept that could deliver higher engine efficiency, as well as lower emissions. Gasoline-like fuel compression ignition (GCI) is beneficial for air/fuel mixing process under PPC mode because of the superior auto-ignition resistance to prolong ignition delay time. In current experiments, three surrogate fuels with same research octane number (RON77) but different octane sensitivities (OS), PRF77 (S = 0), TPRF77-a (S = 3) and TPRF77-b (S = 5), are tested in a full-transparent single cylinder AVL optical compression ignition (CI) engine at low load conditions. Aiming at investigating the fuel octane sensitivity effect on engine combustion behavior as well as emissions under GCI-PPC mode, engine parameters, and emission data during combustion are compared for the test fuels with a change of injection timing. In addition, in order to get a deeper insight into fuel OS effect on GCI-PPC mode, high-speed natural flame luminosity (NFL) imaging techniques are used for visualizing in-cylinder combustion processes. The results show that higher octane sensitivity generally lead to delayed start of combustion, prolonged ignition delay time, retarded combustion phasing of CA50 as well as extended combustion duration. At late injection timing of-15 CAD aTDC, higher IMEP is achieved with higher OS fuel along with lower maximum in-cylinder pressure. A 4% increase of IMEP is achieved by the test fuel with highest OS (TPRF77-b) as compared with zero sensitivity fuel (PRF77). Moreover, the fuel spray vaporization process is affected by fuel octane sensitivity, which introduces some bright tiny spots during the combustion process as well as higher UHC and CO emissions, especially for early injection timing.
    Citation
    Shi, H., An, Y., & Johansson, B. (2019). Study of Fuel Octane Sensitivity Effects on Gasoline Partially Premixed Combustion Using Optical Diagnostics. SAE Technical Paper Series. doi:10.4271/2019-24-0025
    Publisher
    SAE International
    Conference/Event name
    SAE 14th International Conference on Engines and Vehicles, ICE 2019
    DOI
    10.4271/2019-24-0025
    Additional Links
    https://www.sae.org/content/2019-24-0025/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2019-24-0025
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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