2008
NUMERICAL SIMULATION OF ATMOSPHERIC PRESSURE TOWNSEND DISCHARGES IN NITROGEN WITH HYDROGEN GAS ADMIXTURES
JÁNSKÝ, Jaroslav, David TRUNEC, Zdeněk NAVRÁTIL, Ronny BRANDENBURG, Hans-Erich WAGNER et. al.Základní údaje
Originální název
NUMERICAL SIMULATION OF ATMOSPHERIC PRESSURE TOWNSEND DISCHARGES IN NITROGEN WITH HYDROGEN GAS ADMIXTURES
Název česky
Numerická simulace Townsendovského výboje za atmosférického tlaku v dusíku s příměsí vodíku
Autoři
JÁNSKÝ, Jaroslav (203 Česká republika), David TRUNEC (203 Česká republika, garant), Zdeněk NAVRÁTIL (203 Česká republika), Ronny BRANDENBURG (276 Německo) a Hans-Erich WAGNER (276 Německo)
Vydání
Francie, Proccedings of HAKONE X, od s. 1-5, 5 s. 2008
Nakladatel
University of Toulouse
Další údaje
Jazyk
angličtina
Typ výsledku
Stať ve sborníku
Obor
10305 Fluids and plasma physics
Stát vydavatele
Francie
Utajení
není předmětem státního či obchodního tajemství
Kód RIV
RIV/00216224:14310/08:00025015
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova anglicky
electrical discharge; atmospheric pressure; nitrogen
Příznaky
Mezinárodní význam
Změněno: 10. 11. 2008 18:44, prof. RNDr. David Trunec, CSc.
V originále
In this contribution the influence of hydrogen admixture on an Atmospheric Pressure Townsend Discharge (APTD) in nitrogen is investigated by means of numerical modelling and experiments. The numerical model is a one-dimensional fluid model. Electron emission from dielectrics by a diffusion flux of metastable molecules and photoemission are incorporated in the model. The secondary emission due to ions is neglected. The results are compared with measured electrical parameters (ignition voltage, voltage necessary for causing the transition to the filamentary regime and current evolution). The measured and simulated current profiles of discharge in nitrogen-hydrogen mixture are similar for applied voltages close to ignition voltage. The simulations give a qualitative explanation for the measured current profiles in pure nitrogen and for small admixtures of hydrogen. The results indicate that the influence of hydrogen on the APTD is due to the quenching of the main metastable state N2(A 3 Sigma+ u ) by hydrogen molecules and atoms. Generally a APTD typical one peak current structure is caused by secondary electron emission by nitrogen metastable molecules, a current pulse with multiple peaks is caused mainly by secondary emission of ions or photoemission.
Česky
In this contribution the influence of hydrogen admixture on an Atmospheric Pressure Townsend Discharge (APTD) in nitrogen is investigated by means of numerical modelling and experiments. The numerical model is a one-dimensional fluid model. Electron emission from dielectrics by a diffusion flux of metastable molecules and photoemission are incorporated in the model. The secondary emission due to ions is neglected. The results are compared with measured electrical parameters (ignition voltage, voltage necessary for causing the transition to the filamentary regime and current evolution). The measured and simulated current profiles of discharge in nitrogen-hydrogen mixture are similar for applied voltages close to ignition voltage. The simulations give a qualitative explanation for the measured current profiles in pure nitrogen and for small admixtures of hydrogen. The results indicate that the influence of hydrogen on the APTD is due to the quenching of the main metastable state N2(A 3 Sigma+ u ) by hydrogen molecules and atoms. Generally a APTD typical one peak current structure is caused by secondary electron emission by nitrogen metastable molecules, a current pulse with multiple peaks is caused mainly by secondary emission of ions or photoemission.
Návaznosti
| GA202/06/1473, projekt VaV |
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