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    HCCI Octane Number Scale in a Pressure-Temperature Diagram

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    2019-01-0965_Final.pdf
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    Type
    Conference Paper
    Authors
    Masurier, Jean-Baptiste cc
    Elkhazraji, Ali
    Mohammed, Abdulrahman cc
    Johansson, Bengt cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-04-02
    Permanent link to this record
    http://hdl.handle.net/10754/644903
    
    Metadata
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    Abstract
    A new approach for investigating combustion behavior of practical fuels under homogeneous charge compression ignition (HCCI) conditions was developed with the help of a cooperative fuel research (CFR) engine. The method uses a set of two pressure-temperature diagrams and two charts, each with an octane number scale based on primary reference fuels (PRF), created from experimental results by sweeping the intake temperature. The two pressure-temperature diagrams report conditions leading to the start of the low temperature combustion and the start of the main combustion, respectively. Additional two charts - required compression ratio and fraction of low temperature heat release charts - describe global combustion behavior and the importance of the low temperature combustion. Each diagram and chart, together with their respective octane number scale, allow to examine the combustion behavior of practical fuels by comparing their combustion behavior with those of the PRFs. Finally, octane numbers representing the various combustion behaviors of a practical fuel can be rated. Application of the method with two low-octane number surrogate fuels led to the following main results. The required compression ratio chart provides a quick description of the combustion behavior. The pressure-temperature diagrams indicate the ease with which a fuel ignites under low temperature combustion and main combustion regimes. An extra pressure-temperature diagram reports start and end of the negative temperature coefficient regime and highlights that this regime is independent of the fuel. Accordingly, each combustion regime is clearly defined in the pressure-temperature diagram. The fraction of low temperature heat release finally indicates how low temperature combustion vanishes. Finally, octane numbers for each practical fuel were rated from each diagram and chart. Rated octane numbers suggest that a single PRF cannot reflect the entire combustion behavior of a practical fuel; but multiple PRFs are required for HCCI combustion.
    Citation
    Masurier J-B, Elkhazraji A, Mohammed A, Johansson B (2019) HCCI Octane Number Scale in a Pressure-Temperature Diagram. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2019-01-0965.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). The authors also thank Adrian I. Ichim and Riyad H. Jambi for their technical support.
    Publisher
    SAE International
    Journal
    SAE Technical Paper Series
    Conference/Event name
    SAE World Congress Experience, WCX 2019
    DOI
    10.4271/2019-01-0965
    Additional Links
    https://saemobilus.sae.org/content/2019-01-0965/
    ae974a485f413a2113503eed53cd6c53
    10.4271/2019-01-0965
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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