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    Analysis of the step responses of laminar premixed flames to forcing by non-thermal plasma

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    36th-PROCI-2016-Geq_revised-black.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Lacoste, Deanna cc
    Moeck, Jonas P.
    Roberts, William L. cc
    Chung, Suk Ho cc
    Cha, Min Suk cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2016-07-16
    Online Publication Date
    2016-07-16
    Print Publication Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/621731
    
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    Abstract
    The step responses of lean methane-air flames to non-thermal plasma forcing is reported. The experimental setup consists of an axisymmetric burner, with a nozzle made of a quartz tube. The equivalence ratio is 0.95, allowing stabilization of the flame in a V-shape or an M-shape geometry, over a central stainless steel rod. The plasma is produced by short pulses of 10-ns duration, 8-kV maximum voltage amplitude, applied at 10 kHz. The central rod is used as a cathode, while the anode is a stainless steel ring, fixed on the outer surface of the quartz tube. Plasma forcing is produced by positive or negative steps of plasma. The step response of the flame is investigated through heat release rate (HRR) fluctuations, to facilitate comparisons with flame response to acoustic perturbations. The chemiluminescence of CH* between two consecutive pulses was recorded using an intensified camera equipped with an optical filter to estimate the HRR fluctuations. First, the results show that the flame does not respond to each single plasma pulse, but is affected only by the average plasma power, confirming the step nature of the forcing. The temporal evolutions of HRR are analyzed and the flame transfer functions are determined. A forcing mechanism, as a local increase in the reactivity of the fluid close to the rod, is proposed and compared with numerical simulations. Experiments and numerical simulations are in good qualitative agreement. © 2016.
    Citation
    Lacoste DA, Moeck JP, Roberts WL, Chung SH, Cha MS (2016) Analysis of the step responses of laminar premixed flames to forcing by non-thermal plasma. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.06.178.
    Sponsors
    King Abdullah University of Science and Technology[1975]
    Deutsche Forschungsgemeinschaft[ANR-13-IS09-0004]
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2016.06.178
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2016.06.178
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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