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Numerical modelling of negative discharges in air with experimental validation

Numerical modelling of negative discharges in air with experimental validation
Numerical modelling of negative discharges in air with experimental validation
Axisymmetric finite element models have been developed for the simulation of negative discharges in air without and with the presence of dielectrics. The models are based on the hydrodynamic drift-diffusion approximation. A set of continuity equations accounting for the movement, generation and loss of charge carriers (electrons, positive and negative ions) is coupled with Poisson’s equation to take into account the effect of space and surface charges on the electric field. The model of a negative corona discharge (without dielectric barriers) in a needle-plane geometry is analysed first. The results obtained show good agreement with experimental observations for various Trichel pulse characteristics. With dielectric barriers introduced into the discharge system, the surface discharge exhibits some similarities and differences to the corona case. The model studies the dynamics of volume charge generation, electric field variations and charge accumulation over the dielectric surface. The predicted surface charge density is consistent with experimental results obtained from the Pockels experiment in terms of distribution form and magnitude.
0022-3727
015203/1-015203/15
Tran, T N
370aca16-7712-4256-971a-3777d19074d2
Golosnoy, I O
40603f91-7488-49ea-830f-24dd930573d1
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Georghiou, G E
c3e9a8c7-a175-4d3c-aa20-e851d441c30d
Tran, T N
370aca16-7712-4256-971a-3777d19074d2
Golosnoy, I O
40603f91-7488-49ea-830f-24dd930573d1
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Georghiou, G E
c3e9a8c7-a175-4d3c-aa20-e851d441c30d

Tran, T N, Golosnoy, I O, Lewin, P L and Georghiou, G E (2011) Numerical modelling of negative discharges in air with experimental validation. Journal of Physics D: Applied Physics, 44 (1), 015203/1-015203/15. (doi:10.1088/0022-3727/44/1/015203).

Record type: Article

Abstract

Axisymmetric finite element models have been developed for the simulation of negative discharges in air without and with the presence of dielectrics. The models are based on the hydrodynamic drift-diffusion approximation. A set of continuity equations accounting for the movement, generation and loss of charge carriers (electrons, positive and negative ions) is coupled with Poisson’s equation to take into account the effect of space and surface charges on the electric field. The model of a negative corona discharge (without dielectric barriers) in a needle-plane geometry is analysed first. The results obtained show good agreement with experimental observations for various Trichel pulse characteristics. With dielectric barriers introduced into the discharge system, the surface discharge exhibits some similarities and differences to the corona case. The model studies the dynamics of volume charge generation, electric field variations and charge accumulation over the dielectric surface. The predicted surface charge density is consistent with experimental results obtained from the Pockels experiment in terms of distribution form and magnitude.

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Published date: 12 January 2011
Organisations: Electronics & Computer Science, EEE

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Local EPrints ID: 271762
URI: http://eprints.soton.ac.uk/id/eprint/271762
ISSN: 0022-3727
PURE UUID: 97a46877-fb52-4e18-ac80-de27efacb034

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Date deposited: 08 Dec 2010 15:49
Last modified: 30 Sep 2019 19:11

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