Detail publikace

Modelling of a Heavy-Current Intensively Blasted Electric Arc at Atmospheric Pressure

Lázničková, I., Jakubová, I., Šenk, J.

Originální název

Modelling of a Heavy-Current Intensively Blasted Electric Arc at Atmospheric Pressure

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The paper deals with intensively blasted electric arc burning in argon in a cylindrical channel of a designed experimental arc heater. The measured values of the arc current, the total voltage between a tungsten cathode and a grounded copper anode, the argon flow rate, and the water flow rates and temperature increments in individual parts of the arc heater characterize the operational conditions, but the parameters of the arc inside remain hidden. The simplified mathematical model has been designed to reveal the arc behavior in the arc heater channel, namely the arc radius and arc temperature development. The model is based on the energy and mass conservation laws and Ohm’s law and utilizes theoretically calculated transport and thermodynamic properties of argon altogether with the measured results as input data. Some simplifying assumptions are applied. A two-zone arrangement with a hot arc zone in the middle and a cold zone near the channel wall is supposed. The arc radius development along the arc heater’s channel is described by Schlichting’s formula for a free beam. Such combinations of three characteristic values of exponent n_r, current density j_0 at the cathode tip, and arc temperature T_A(s) at the end of the near-cathode layer are sought to enable as close as possible accordance between the computed and experimental data. Thereafter, a slight tuning of these parameters is needed to avoid extreme values of electric field intensity and temperature oscillations near the cathode while not to substantially worsen the reached agreement of measured and computed values. The functionality of the model is demonstrated using four typical sets of experimental data.

Klíčová slova

electric arc, argon, arc heater, experiment, model

Autoři

Lázničková, I., Jakubová, I., Šenk, J.

Vydáno

9. 9. 2021

Nakladatel

IOP Publishing Ltd.

Místo

UK

ISSN

0963-0252

Periodikum

PLASMA SOURCES SCIENCE & TECHNOLOGY

Ročník

30

Číslo

9

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1

Strany do

13

Strany počet

13

URL

https://iopscience.iop.org/article/10.1088/1361-6595/ac1dee

BibTex

@article{BUT172494,
  author="Ilona {Lázničková} and Ivana {Jakubová} and Josef {Šenk}",
  title="Modelling of a Heavy-Current Intensively Blasted Electric Arc at Atmospheric Pressure",
  journal="PLASMA SOURCES SCIENCE & TECHNOLOGY",
  year="2021",
  volume="30",
  number="9",
  pages="1--13",
  doi="10.1088/1361-6595/ac1dee",
  issn="0963-0252",
  url="https://iopscience.iop.org/article/10.1088/1361-6595/ac1dee"
}