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    Compression Ratio and Intake Air Temperature Effect on the Fuel Flexibility of Compression Ignition Engine

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    Name:
    CR and IT Effect on Fuel Flex - Final.pdf
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    2.859Mb
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    PDF
    Description:
    Accepted Manuscript
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    Type
    Conference Paper
    Authors
    AlRamadan, Abdullah
    Ben Houidi, Moez cc
    Aljohani, Bassam S.E.
    Eid, Hassan
    Johansson, Bengt cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-09-09
    Embargo End Date
    2020-03-10
    Permanent link to this record
    http://hdl.handle.net/10754/661322
    
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    Abstract
    The effect of compression ratio (CR) and intake air temperature on the combustion characteristics of fuels with different octane ratings were investigated on a single-cylinder heavy duty engine. The study focused on Primary Reference Fuels (PRFs) and commercial grade diesel with octane numbers ranging from 0 to 100. The engine was configured at a CR of 11.5:1, which is lower than typical heavy-duty compression ignition CI engines. This aims to compare the fuels' burning regime with recently reported measurements at CR17:1. Experiments were performed at different intake air temperatures of 20 to 80 °C and net indicated mean effective pressure (IMEPNet) of 5 to 20 bar. The injection rates have been characterized to determine the hydraulic delay of the injector and thus define the actual ignition delay time. At low loads, diesel-like fuels were found to burn in partially premixed combustion (PPC) mode whereas high octane fuels did not ignite. At high loads, fuels combustion becomes diffusion driven regardless of their RON or MON values. The effect of intake air temperature on the combustion characteristics depended on the combination of the octane ratings and the engine load. At high loads, fuels with low octane numbers were insensitive to the change of the intake air temperature. The ignition delay time was short enough to maintain a diffusion driven combustion. At lower loads, it is more challenging to reach conditions where the combustion characteristics are invariant regardless of the fuel's RON and MON values (Fuel Flexible). At the low tested compression ratio of 11.5:1, the extent of fuel flexibility is limited to only high loads (IMEPNet = 20 bar) whereas it is extended to intermediate loads (IMEPNet = 10 and 15 bar) at CR17:1.
    Citation
    AlRamadan, A. S., Ben Houidi, M., Aljohani, B. S. E., Eid, H., & Johansson, B. (2019). Compression Ratio and Intake Air Temperature Effect on the Fuel Flexibility of Compression Ignition Engine. SAE Technical Paper Series. doi:10.4271/2019-24-0110
    Publisher
    SAE International
    Conference/Event name
    SAE 14th International Conference on Engines and Vehicles, ICE 2019
    DOI
    10.4271/2019-24-0110
    Additional Links
    https://www.sae.org/content/2019-24-0110/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2019-24-0110
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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