Cristin-resultat-ID: 1162812
Sist endret: 20. februar 2015, 12:22
NVI-rapporteringsår: 2014
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2014

Numerical simulation of positive streamer propagation in cyclohexane

Bidragsytere:
  • Øystein Leif Hestad
  • Torstein Grav
  • Lars Esben Lundgaard
  • Stian Ingebrigtsen
  • M. Unge og
  • O. Hjortstam

Bok

2014 IEEE 18th International Conference on Dielectric Liquids ICDL
ISBN:
  • 9781479920655

Utgiver

Curran Associates, Inc.
NVI-nivå 0

Serie

Proceedings of IEEE International Conference on Dielectric Liquids
ISSN 2153-3725
e-ISSN 2153-3733
NVI-nivå 1

Om resultatet

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Publiseringsår: 2014
Hefte: 2014
ISBN:
  • 9781479920655

Klassifisering

Fagfelt (NPI)

Fagfelt: Elektrofag
- Fagområde: Realfag og teknologi

Beskrivelse Beskrivelse

Tittel

Numerical simulation of positive streamer propagation in cyclohexane

Sammendrag

A numerical 3D simulation of positive streamer propagation in a liquid, using cyclohexane as a reference case, in a needle-plane geometry is presented. The physical basis of this model is a version of the Townsend-Meek streamer criteria, known from gas discharges, adapted to a liquid containing an additive. The propagation of the streamer is modelled in the following way: Electrons located in an electric field above a given threshold (liquid dependent) create electron avalanches in the liquid. The electron avalanches leave behind positive ions that will move the high field region further into the liquid due to the field created by the high charge concentration. Subsequent avalanches in the liquid neutralize this region, but create a new highly ionized region, thus the ionization region (streamer head) moves further away from the needle, while still being connected to the needle by a weakly conducting plasma channel. The stochastic nature of streamer inception, propagation and branching is modeled through a random distribution of seed electrons in the liquid. Key results obtainable from the model includes streamer shape/degree of branching, speed (instantaneous and average), and inception delay of positive streamers as a function of applied voltage. The presented model is crude as it does not take into account the energy required for phase transition, and the dynamics of the plasma channel trailing the streamer head. In addition it is based on a rough estimate of the field in the liquid. This paper presents the model in detail.

Bidragsytere

Øystein Leif Gurandsrud Hestad

Bidragsyterens navn vises på dette resultatet som Øystein Leif Hestad
  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Torstein Grav Aakre

Bidragsyterens navn vises på dette resultatet som Torstein Grav
  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Lars Esben Lundgaard

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Stian Ingebrigtsen

  • Tilknyttet:
    Forfatter
    ved ABB AS

M. Unge

  • Tilknyttet:
    Forfatter
    ved Sverige
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2014 IEEE 18th International Conference on Dielectric Liquids ICDL.

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