Characteristics of meter-scale surface electrical discharge propagating along water surface at atmospheric pressure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00463763" target="_blank" >RIV/61389021:_____/16:00463763 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0022-3727/49/41/415202" target="_blank" >http://dx.doi.org/10.1088/0022-3727/49/41/415202</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0022-3727/49/41/415202" target="_blank" >10.1088/0022-3727/49/41/415202</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characteristics of meter-scale surface electrical discharge propagating along water surface at atmospheric pressure

Popis výsledku v původním jazyce

This paper reports physical characteristics of water surface discharges. Discharges were produced by metal needle-to-water surface geometry, with the needle electrode driven by 47 kV/2 micro s (FWHM) positive voltage pulses. Propagation of the discharges along water surface was confined between glass plates with 2 mm separation. This allowed generation of highly reproducible 634 mm-long plasma filaments. Experiments were performed using different atmospheres: air, N2, and O2, each at atmospheric pressure. Time- and spatially-resolved spectroscopic measurements revealed that early spectra of discharges in air and nitrogen atmospheres were dominated by N2 2nd positive system. N2 radiation disappeared after approx. 150 ns, replaced by emissions from atomic hydrogen. Spectra of discharges in O2 atmosphere were dominated by emissions from atomic oxygen. Time- and spatially-resolved emission spectra were used to determine temperatures in plasma. Atomic hydrogen emissions showed excitation temperature of discharges in air to be about 2104 K. Electron number densities determined by Stark broadening of the hydrogen Hbeta line reached a maximum value of 1018 cm-3 just after plasma initiation. Electron number densities and temperatures depended only slightly on distance from needle electrode, indicating formation of high conductivity leader channel Direct observation of discharges by high speed camera showed that the average leader head propagation speed was 412 kms-1, which is substantially higher value than that observed in experiments with shorter streamers driven by lower voltages.

Název v anglickém jazyce

Characteristics of meter-scale surface electrical discharge propagating along water surface at atmospheric pressure

Popis výsledku anglicky

This paper reports physical characteristics of water surface discharges. Discharges were produced by metal needle-to-water surface geometry, with the needle electrode driven by 47 kV/2 micro s (FWHM) positive voltage pulses. Propagation of the discharges along water surface was confined between glass plates with 2 mm separation. This allowed generation of highly reproducible 634 mm-long plasma filaments. Experiments were performed using different atmospheres: air, N2, and O2, each at atmospheric pressure. Time- and spatially-resolved spectroscopic measurements revealed that early spectra of discharges in air and nitrogen atmospheres were dominated by N2 2nd positive system. N2 radiation disappeared after approx. 150 ns, replaced by emissions from atomic hydrogen. Spectra of discharges in O2 atmosphere were dominated by emissions from atomic oxygen. Time- and spatially-resolved emission spectra were used to determine temperatures in plasma. Atomic hydrogen emissions showed excitation temperature of discharges in air to be about 2104 K. Electron number densities determined by Stark broadening of the hydrogen Hbeta line reached a maximum value of 1018 cm-3 just after plasma initiation. Electron number densities and temperatures depended only slightly on distance from needle electrode, indicating formation of high conductivity leader channel Direct observation of discharges by high speed camera showed that the average leader head propagation speed was 412 kms-1, which is substantially higher value than that observed in experiments with shorter streamers driven by lower voltages.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics D-Applied Physics

ISSN

0022-3727

e-ISSN

—

Svazek periodika

49

Číslo periodika v rámci svazku

41

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

000385384000002

EID výsledku v databázi Scopus

2-s2.0-85007545049