From: Paul
Date: Fri, 25 Oct 2002 06:42:34 +0100
Subject: Re: [TSSP] Top Voltage
Marco,
Is this one available in pdf from your library?
AUTHOR: Bondiou, A.; Gallimberti, I.
TITLE: Theoretical modelling of the development of the positive
spark in long gaps
SOURCE: Journal of Physics D (Applied Physics), vol.27, no.6,
p. 1252-66
ISSN: 0022-3727
YEAR: 14 June 1994
ABSTRACT:
> The main purpose of this paper is to present a physical
> model of the positive discharge in long air gaps. A large
> number of previous experimental and theoretical studies led
> to the identification of the different successive phases of
> the spark development: formation and propagation of first
> corona streamers, inception of the conductive stem at the
> electrode tip, formation and development of second corona
> (or 'leader corona') from the stem, and, eventually, the
> propagation of the leader and leader corona system until the
> final jump preceding the arc onset.
:)
> Details of the specific modelling of each phase is presented,
> using the classical equations for conservation of mass, momentum
> and energy for each particle species. These basic equations are
> simplified according to the dominant electrostatic, hydrodynamic
> or thermodynamic processes involved in each step of the spark
> development.
:))
> The resulting models for simulation of the corona and leader
> phases are coupled with an analytical calculation of the electric
> field due to the electrodes, the leader channel and the space
> charge injected into the gap.
:)))
> The different phase simulation models are expressed with a
> homogeneous simplification level and then linked
> sequentially into a complete model, which performs the step-
> by-step simulation of all the successive discharges phases
> until the final jump.
o))
> The model described here is self-
> consistent since the only input data are the electrode
> geometry and the applied potential wave-shape.
!!
> A good agreement between computed and experimental results
> has been obtained in various test configurations;
> the model has been also used to simulate the discharge behaviour
> with perturbations of the applied potential wave and permits the
> analysis of the conditions for stable propagation of the
> positive leader. It is shown that some parameters of
> practical interest, as the 50% breakdown voltage or the time
> to breakdown can be derived from the proposed model
o))!!
--
Paul Nicholson,
--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.