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Journal of Applied Physics / Volume 107 / Issue 9 / ARTICLES / Plasmas and Electrical Discharges

J. Appl. Phys. 107, 093303 (2010); http://dx.doi.org/10.1063/1.3309758 (15 pages)

Transitions between corona, glow, and spark regimes of nanosecond repetitively pulsed discharges in air at atmospheric pressure

David Z. Pai, Deanna A. Lacoste, and Christophe O. Laux

Laboratoire EM2C, CNRS UPR288, Ecole Centrale Paris, 92295 Châtenay-Malabry, France

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(Received 18 October 2009; accepted 12 January 2010; published online 6 May 2010)

In atmospheric pressure air preheated from 300 to 1000 K, the nanosecond repetitively pulsed (NRP) method has been used to generate corona, glow, and spark discharges. Experiments have been performed to determine the parameter space (applied voltage, pulse repetition frequency, ambient gas temperature, and interelectrode gap distance) of each discharge regime. In particular, the experimental conditions necessary for the glow regime of NRP discharges have been determined, with the notable result that there exists a minimum and maximum gap distance for its existence at a given ambient gas temperature. The minimum gap distance increases with decreasing gas temperature, whereas the maximum does not vary appreciably. To explain the experimental results, an analytical model is developed to explain the corona-to-glow (C-G) and glow-to-spark (G-S) transitions. The C-G transition is analyzed in terms of the avalanche-to-streamer transition and the breakdown field during the conduction phase following the establishment of a conducting channel across the discharge gap. The G-S transition is determined by the thermal ionization instability, and we show analytically that this transition occurs at a certain reduced electric field for the NRP discharges studied here. This model shows that the electrode geometry plays an important role in the existence of the NRP glow regime at a given gas temperature. We derive a criterion for the existence of the NRP glow regime as a function of the ambient gas temperature, pulse repetition frequency, electrode radius of curvature, and interelectrode gap distance.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP AND METHODS
    1. Experimental setup
    2. Method for measuring the energy deposited per pulse
  3. EXPERIMENTAL RESULTS
    1. Influence of the pulse repetition frequency on discharge regimes
    2. Influence of ambient gas temperature on discharge regimes
    3. Influence of interelectrode gap distance on discharge regimes
    4. Range of gap distances for existence of NRP glow regime
  4. THEORY OF REGIME TRANSITIONS OF NRP DISCHARGES
    1. The NRP C-G transition
      1. Streamer phase
      2. Conduction phase
      3. C-G regime transition voltage
    2. The NRP G-S transition
    3. Existence of the NRP glow regime
  5. CONCLUSION

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KEYWORDS and PACS

Keywords

corona, electric breakdown, electrodes, electron avalanches, glow discharges, sparks

PACS

  • 52.80.Hc

    Glow; corona

  • 52.80.Mg

    Arcs; sparks; lightning; atmospheric electricity

  • 51.50.+v

    Electrical properties (ionization, breakdown, electron and ion mobility, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3309758

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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