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    Enhancement of the lean stability and blow-off limits of methane-air swirl flames at elevated pressures by nanosecond repetitively pulsed discharges

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    sam_EEnhancemeng of the.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Di Sabatino, Francesco cc
    Lacoste, Deanna cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-06-18
    Online Publication Date
    2020-06-18
    Print Publication Date
    2020-08-26
    Submitted Date
    2020-03-20
    Permanent link to this record
    http://hdl.handle.net/10754/662711
    
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    Abstract
    This paper examines the ability of nanosecond repetitively pulsed (NRP) plasma discharges to improve stabilization and extend the blow-off limit of lean premixed methane-air swirl flames at pressures up to 5 bar. The effect of two discharge regimes, NRP glows and NRP sparks, was investigated. The electrical characterization of the discharges was performed and direct images at 60 Hz of the flames, with and without NRP discharges, were collected to assess the effect of the discharges on flame stabilization. Results showed that NRP discharges efficiently extended the lean blow-off and stability limits of premixed methane-air swirl flames, at pressures up to 5 bar. These results were obtained for a ratio of NRP discharge power to flame thermal power of 0.7% or less. Moreover, the peak voltage necessary to maintain constant this power ratio did not increase linearly with increased pressure, even though the reduced electric field should linearly decrease with the pressure. It was also observed that the relative effectiveness of the NRP glows and NRP sparks changed by increasing the pressure. Based on discharge physics and current knowledge of the effect of pressure on the electrical properties of flames, explanations for these results are proposed.
    Citation
    Di Sabatino, F., & Lacoste, D. A. (2020). Enhancement of the lean stability and blow-off limits of methane-air swirl flames at elevated pressures by nanosecond repetitively pulsed discharges. Journal of Physics D: Applied Physics. doi:10.1088/1361-6463/ab8f54
    Sponsors
    This work is funded by the King Abdullah University of Science and Technology, the Deutsche Forschungsgemeinschaft, and the Agence Nationale de la Recherche, through the GECCO project.
    Publisher
    IOP Publishing
    Journal
    Journal of Physics D: Applied Physics
    DOI
    10.1088/1361-6463/ab8f54
    Additional Links
    https://iopscience.iop.org/article/10.1088/1361-6463/ab8f54
    ae974a485f413a2113503eed53cd6c53
    10.1088/1361-6463/ab8f54
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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