Non-equilibrium Studies in Switching Arc Plasmas in Japan

Authors

  • Y. Tanaka Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192
  • K. Tomita Kushu University, Kasuga, Fukuoka 816-8580
  • Y. Inada Saitama University, 542 Shimo-Okubo, Sakura, Saitama
  • A. Kumada The University of Tokyo,7-3-1 Hongo, Bunkyo, Tokyo 113-8654
  • K. Hidaka The University of Tokyo,7-3-1 Hongo, Bunkyo, Tokyo 113-8654
  • T. Fujino University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577
  • K. Suzuki Tokyo Denki University, 5 Senju Aasahi, Adachi, Tokyo 120-8551
  • T. Shinkai Tokyo University of Technology, 1404-1 Katakura, Hachioji, Tokyo 192-0982

DOI:

https://doi.org/10.14311/ppt.2017.3.225

Keywords:

local thermodynamic equilibrium, chemically non-equilibrium, thermally non-equilibrium, electron density measurement

Abstract

This paper briefly introduce research work examples of non-equilibrium studies in switching arcs. In understanding arc behavior, one often assumes local thermodynamic equilibrium (LTE) condition in the arc plasma. However, actual arc plasmas are not completely and not always in LTE state because of strong temperature change temporally and spatially, and high electric field application etc. Recently, we have a collaboration work in numerical simulations and experimental approaches for decaying arcs without LTE assumption. First, our numerical model is presented for decaying arcs without chemical equilibrium assumption. Secondly, two experimental methods are introduced for measuring electron density in decaying arcs without LTE assumption: Laser Thomson Scattering method and the Schack-Hartmann method. Finally, comparison results is shown between the LTE simulation, the chemically non-equilibrium simulation, and the above experimental measurements.

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Published

2017-02-12

Issue

Vol. 4 No. 3 (2017)

Section

Review Papers

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