The LTE thermofluid simulation of AR/SF6 gas-blast arcs in a nozzle space in an arc device

Kosuke Murai, Tomoyuki Nakano, Yasunori Tanaka, Yoshihiko Uesugi, Tatsuo Ishijima, Kentaro Tomita, Katsumi Suzuki, Takanori Iijima, Takeshi Shinkai

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The present paper describes numerical thermofluid simulation results of SF6, Ar, and Ar/SF6 arcs in a nozzle space at atmospheric pressure on the assumption of local thermodynamic equilibrium (LTE) condition. It is crucial to investigate fundamentals on arc extinction phenomena by numerical simulation approach as well as experimental approach. Two-dimensional temperature distributions in SF6, Ar, Ar/SF6 gas-blast arcs were calculated in a steady state at a direct current of 50 A. Furthermore, transient temperature distributions in these arcs were computed under free recovery condition for a fundamental study. We investigated dependences of the gas mixture ratio of SF6 to Ar and the gas flow velocity on the arc temperature and the arc voltage. The calculated arc voltage in the steady state and the transition of electron density under free recovery condition were compared with those obtained by laser Thomson scattering method in our experiments. As a result, the increasing admixture ratio of SF6 to Ar and the increasing gas flow velocity shrinks the arc plasma around nozzle throat inlet, leading to the higher arc resistance. Under free recovery condition, the arc plasma decay more rapidly there. Comparison in electron density shows the similar dependence on SF6 and Ar, while there is still some difference in the absolute value of electron density between the calculation results and experimental results.

Original languageEnglish
Pages (from-to)741-748
Number of pages8
JournalIEEJ Transactions on Power and Energy
Volume136
Issue number9
DOIs
Publication statusPublished - Jan 1 2016

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Carrier concentration
Nozzles
Thermodynamics
Recovery
Flow velocity
Flow of gases
Temperature distribution
Gases
Plasmas
Computer simulation
Electric potential
Gas mixtures
Atmospheric pressure
Scattering
Lasers
Experiments
Temperature

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

The LTE thermofluid simulation of AR/SF6 gas-blast arcs in a nozzle space in an arc device. / Murai, Kosuke; Nakano, Tomoyuki; Tanaka, Yasunori; Uesugi, Yoshihiko; Ishijima, Tatsuo; Tomita, Kentaro; Suzuki, Katsumi; Iijima, Takanori; Shinkai, Takeshi.

In: IEEJ Transactions on Power and Energy, Vol. 136, No. 9, 01.01.2016, p. 741-748.

Research output: Contribution to journalArticle

Murai, K, Nakano, T, Tanaka, Y, Uesugi, Y, Ishijima, T, Tomita, K, Suzuki, K, Iijima, T & Shinkai, T 2016, 'The LTE thermofluid simulation of AR/SF6 gas-blast arcs in a nozzle space in an arc device', IEEJ Transactions on Power and Energy, vol. 136, no. 9, pp. 741-748. https://doi.org/10.1541/ieejpes.136.741
Murai, Kosuke ; Nakano, Tomoyuki ; Tanaka, Yasunori ; Uesugi, Yoshihiko ; Ishijima, Tatsuo ; Tomita, Kentaro ; Suzuki, Katsumi ; Iijima, Takanori ; Shinkai, Takeshi. / The LTE thermofluid simulation of AR/SF6 gas-blast arcs in a nozzle space in an arc device. In: IEEJ Transactions on Power and Energy. 2016 ; Vol. 136, No. 9. pp. 741-748.
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