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Mécanismes d’interaction entre décharges nanosecondes répétitives pulsées et écoulements laminaires réactifs

Abstract : The interactions between Nanosecond Repetitively Pulsed plasma discharges and laminar reactive flows are investigated.The influence of steady and unsteady air flows on the regimes of NRP discharges is investigated. The results are interpreted with the use of characteristic dimensionless numbers; this analysis allows to highlight a synergetic effect between the high-voltage pulses as well as the power of the pulses on the NRP discharge regime observed. Then, an investigation of the effect of laminar premixed methane-air flames on NRP discharges is presented. An effect of the flame on the NRP corona discharges is displayed; this effect is a function of the proximity of the flame to the discharges. the influence of the inter-electrode gas mixture on the shape of the plasma discharges is also visually assessed. Finally, the effect of NRP corona discharges on laminar premixed flat flames is investigated. The NRP discharges induce a displacement of the flame in the upstream direction which is verified with numerical simulations.This study displays the effect of NRP discharges on a flame and gives insights as to the phenomenon underlying this effect. Moreover, the study highlights the opposite effect of reactive mixtures on the NRP discharges. The visual modification of the NRP discharges is a function of the transport of the inter-electrode flow and of the nature of the gas itself.
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Submitted on : Wednesday, December 20, 2017 - 10:29:01 AM
Last modification on : Friday, July 3, 2020 - 9:28:03 AM


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Sylvain Heitz. Mécanismes d’interaction entre décharges nanosecondes répétitives pulsées et écoulements laminaires réactifs. Autre. Université Paris-Saclay; Technische Universität (Berlin), 2017. Français. ⟨NNT : 2017SACLC069⟩. ⟨tel-01668586⟩



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