Poster De Conférence Année : 2017

Influence of water vapour on the propagation speed and mean energy of an atmospheric non-equilibrium diffuse discharge in air under very high electric fields

Résumé

We report results on the influence of relative humidity (RH) on the propagation, temperature and the energy of a pin-to-plane nanosecond pulse discharge at atmospheric pressure. Water vapour only impacts discharges after a given relative humidity threshold, for which propagation is first slowed down, but accelerates faster than usual close to the plane. Energy is unchanged.

Results on propagation speed:

Results on light intenisty profiles: Plane V = 80kV Pin * Faster propagation as voltage increases. * Linear propagation until the discharge reaches about 3/4 of the gap. * Acceleration close to the plane, Stronger acceleration in humid air. * Existence of a threshold of relative humidity (RH) around 30% above which the propagation speed is affected. * Significant slowing down effect on propagation speed for voltages >65kV. * Non-linear evolution of the propagation speed for RH beyond this threshold. * Linear evolution of propagation speed for high RH At high humidity, possible influence of water molecular aggregates on the propagation speed maybe through electronic attachment, electronic fragmentation, photon absorption… * Low temperature around 300K ± 40K at 65kV, around 320K ± 20K at 75kV and around 330K at 85kV * Little temperature increase with voltage peak. * No influence of the presence of water vapour on the gas temperature * Constant mean energy with water vapour.

* At voltages close to 65kV, the mean energy is about 4mJ (±1mJ). At 75kV, it reaches at 16mJ (±1mJ) and at 85kV, 32mJ (±4mJ). Spectroscopic parameters : * Spatial integration over all the discharge volume * 10 ns time average * 2400 gr/mm for good spectral resolution

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Dates et versions

hal-04917314 , version 1 (28-01-2025)

Identifiants

  • HAL Id : hal-04917314 , version 1

Citer

Alexandra Brisset, Pierre Tardiveau, Kristaq Gazeli, B. Bournonville, P. Jeanney, et al.. Influence of water vapour on the propagation speed and mean energy of an atmospheric non-equilibrium diffuse discharge in air under very high electric fields. 23rd International Symposium on Plasma Chemistry, Jul 2017, Montréal, Canada. ⟨hal-04917314⟩
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