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    Effect of the plasma location on the deflagration-to-detonation transition of a hydrogen–air flame enhanced by nanosecond repetitively pulsed discharges

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    Name:
    PROCI-D-19-01513_R2_black_2C_submitted.pdf
    Size:
    2.535Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-09-18
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    Type
    Article
    Authors
    Gray, Joshua A.T. cc
    Lacoste, Deanna cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    BAS/1/1396-01-01
    Date
    2020-09-18
    Online Publication Date
    2020-09-18
    Print Publication Date
    2020-09
    Embargo End Date
    2022-09-18
    Submitted Date
    2019-11-08
    Permanent link to this record
    http://hdl.handle.net/10754/665386
    
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    Abstract
    This work presents a method for using nanosecond repetitively pulsed (NRP) plasma discharges for accelerating a propagating flame such that the deflagration-to-detonation transition occurs. A strategy is developed for bringing the location of the plasma near the tube wall and, thus, reducing the presence of the electrodes in the combustion tube as well as presenting a configuration in which cooling of the electrodes is viable for practical applications. Time-of-flight measurements were used in combination with energy deposition measurements and high-speed OH*-chemiluminescence imagery to investigate the flame acceleration process. For stoichiometric hydrogen–air flames, successful transition to detonation was achieved by applying a burst of 110 pulses at 100 kHz, with energies as low as 10 mJ per pulse. This was also achieved when plasma discharges were applied in the vicinity of the wall. Two enhancement mechanisms for flame acceleration were identified. The essential role of shock–flame interaction was established as being the main mechanism for flame acceleration when the discharges are located near the wall. This work presents an effective alternative that allows for NRP discharges to be applied near the wall while successfully maintaining a promising success rate for detonation transition.
    Citation
    Gray, J. A. T., & Lacoste, D. A. (2020). Effect of the plasma location on the deflagration-to-detonation transition of a hydrogen–air flame enhanced by nanosecond repetitively pulsed discharges. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.369
    Sponsors
    This work is supported by the King Abdullah University of Science and Technology, through the baseline fund BAS/1/1396-01-01.
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.06.369
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920304958
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.06.369
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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