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    Effect of Mixture Formation and Injection Strategies on Stochastic Pre-Ignition

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    Type
    Conference Paper
    Authors
    Singh, Eshan cc
    Jaasim, Mohammed
    Ichim, Adrian
    Morganti, Kai
    Dibble, Robert W. cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Sciences and Engineering (PSE) Division
    Date
    2018-09-10
    Permanent link to this record
    http://hdl.handle.net/10754/631598
    
    Metadata
    Show full item record
    Abstract
    Stochastic pre-ignition remains one of the major barriers limiting further engine downsizing and down-speeding; two widely used strategies for improving the efficiency of spark-ignited engines. One of the most cited mechanisms thought to be responsible for pre-ignition is the ignition of a rogue droplet composed of lubricant oil and fuel. This originates during mixture formation from interactions between the fuel spray and oil on the cylinder liner. In the present study, this hypothesis is further examined using a single cylinder supercharged engine which employs a range of air-fuel mixture formation strategies. These strategies include port-fuel injection (PFI) along with side and central direct injection (DI) of an E5 gasoline (RON 97.5) using single and multiple injection events. Computational fluid dynamic (CFD) calculations are then used to explain the observed trends. Overall, this study reinforces that interactions between the fuel spray and oil on the cylinder liner can be an important contributor towards stochastic pre-ignition. The occurrence of pre-ignition, as shown by CFD calculations, is successful after completion of two stages. The first stage involves the formation of precursors from interactions between the fuel spray and oil on the cylinder liner. This is shown to be dependent upon the mass of the fuel impinging on the cylinder liner. The second stage involves the ignition of the precursor, which is shown to be dependent upon the temperature of the air-fuel mixture near top dead center.
    Citation
    Singh E, Mubarak Ali MJ, Ichim A, Morganti K, Dibble R (2018) Effect of Mixture Formation and Injection Strategies on Stochastic Pre-Ignition. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2018-01-1678.
    Sponsors
    The authors wish to acknowledge funding from the Clean Combustion Research Center at King Abdullah University of Science and Technology and Saudi Aramco under the FUELCOM II program. The authors also thank Nimal Naser for discussions on the project. The simulations utilized the KAUST supercomputing facility provided by KASUT Information Technology Service. We thank Convergent Science for providing the CONVERGE licenses.
    Publisher
    SAE International
    Journal
    SAE Technical Paper Series
    Conference/Event name
    SAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018
    DOI
    10.4271/2018-01-1678
    Additional Links
    https://saemobilus.sae.org/content/2018-01-1678
    ae974a485f413a2113503eed53cd6c53
    10.4271/2018-01-1678
    Scopus Count
    Collections
    Conference Papers; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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