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2019, vol. 67, br. 3, str. 601-613
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Pražnjenje u nanosekundama pri atmosferskom pritisku od neuniformne elektrode (vrh) prema ravnoj elektrodi
Submicrosecond atmospheric electric discharge from the non-uniform electrode (tip) towards the plane electrode
Sažetak
U radu se razmatraju rezultati numeričke simulacije brzog pražnjenja pri atmosferskom pritisku u visoko nehomogenoj konfiguraciji diode tipa vrh-ravan napunjene smešom azota i kiseonika. Simulacija se zasniva na savremenom hidrodinamičkom modelu pražnjenja plazme, koji takođe uzima u obzir fotojonizaciju gasa. Pokazano je da se, u odsustvu fotojonizujućeg pražnjenja, on razvija slično kao i kod fotojonizacije, sa izuzetkom napona inverzne polarizacije. Teorijski rezultati su konzistentni sa postojećim eksperimentalnim podacima za prostornu strukturu pražnjenja i za karakteristike pražnjenja napona/struje.
Abstract
This paper deals with the results of a numerical simulation of the fast atmospheric pressure discharge in a strongly non-uniform configuration of a tip-to-plane diode filled with a nitrogen and oxygen mixture. The simulation is based on the advanced hydrodynamic plasma discharge accounting also gas photoionization. It was shown that, in the absence of photoionization, discharge develops similarly to the case with photoionization, except the case of reversed voltage polarity. The theoretical results correspond to the existing experimental data for the spatial discharge structure and the current/voltage discharge characteristics.
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