What question did this study set out to answer?

To evaluate the electrical and optical properties of positive DC corona discharges across different applied voltages and electrode gap distances.

January 4, 2023Journal of Applied PhysicsOpen Access

On the different regimes of positive DC corona discharges as a function of electrical and geometrical parameters

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Authors

HYHuijie YanFujian Normal University NBNicolas BénardNational Council for Scientific Research ÉMÉric MoreauCentre National de la Recherche Scientifique

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Implication

Experimental study demonstrates three distinct discharge regimes in needle-to-plate positive DC coronas, revealing a previously unreported intermediate streamer phase.

Key Points

To evaluate the electrical and optical properties of positive DC corona discharges across different applied voltages and electrode gap distances.
Generated positive DC corona discharges in a needle-to-plate configuration using a commercial tungsten needle with a polished surface finish.
Tracked discharge current characteristics and optical dynamics using electrical measurements, direct photography, and intensified camera visualization across varied electrode gaps.
Observed an initial glow regime following Townsend's law, followed at a first voltage threshold by an intermediate regime with ~20 kHz single-bump pulses where streamers span only half the gap.
Detected a transition at a second voltage threshold into a breakdown streamer regime marked by lower pulse frequency (a few kHz) and double-bump current pulses from primary and secondary streamers.
Demonstrated that narrowing the electrode gap increases pulse magnitude and frequency, causing a growing upward deviation in total current relative to Townsend's theoretical curve.

Cite This Study

Yan et al. (2023) studied this question.

synapsesocial.com/papers/6a86d1b536c36f97809eb85b https://doi.org/10.1063/5.0131122

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Implication

Experimental study demonstrates three distinct discharge regimes in needle-to-plate positive DC coronas, revealing a previously unreported intermediate streamer phase.

On the different regimes of positive DC corona discharges as a function of electrical and geometrical parameters

Discussion

Member takes

Implication

Key Points

Cite This Study

On the different regimes of positive DC corona discharges as a function of electrical and geometrical parameters

Discussion

Member takes

Implication

Key Points

Cite This Study

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