The LTE Thermofluid Simulation of Ar/SF6 Gas-Blast Arcs in a Nozzle Space in an Arc Device

カテゴリ: 論文誌(論文単位)

グループ名: 【B】電力・エネルギー部門

発行日: 2016/09/01

タイトル(英語): The LTE Thermofluid Simulation of Ar/SF6 Gas-Blast Arcs in a Nozzle Space in an Arc Device

著者名: Kosuke Murai (Faculty of Electrical and Computer Engineering, Kanazawa University), Tomoyuki Nakano (Faculty of Electrical and Computer Engineering, Kanazawa University), Yasunori Tanaka (Faculty of Electrical and Computer Engineering, Kanazawa University

著者名(英語): Kosuke Murai (Faculty of Electrical and Computer Engineering, Kanazawa University), Tomoyuki Nakano (Faculty of Electrical and Computer Engineering, Kanazawa University), Yasunori Tanaka (Faculty of Electrical and Computer Engineering, Kanazawa University/Research Center for Sustainable Energy and Technology, Kanazawa University), Yoshihiko Uesugi (Faculty of Electrical and Computer Engineering, Kanazawa University/Research Center for Sustainable Energy and Technology, Kanazawa University), Tatsuo Ishijima (Research Center for Sustainable Energy and Technology, Kanazawa University), Kentaro Tomita (Department of Applied Science for Electronics and Materials, Kyushu University), Katsumi Suzuki (Department of Electrical and Electronic Engineering, Tokyo Denki University), Takanori Iijima (Power Systems Company, Toshiba Corporation), Takeshi Shinkai (Power Systems Company, Toshiba Corporation)

キーワード: gas circuit breaker,SF6,arc,numerical thermofluid simulation,Local thermodynamic equilibrium

要約(英語): 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 50A. 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.

本誌: 電気学会論文誌B（電力・エネルギー部門誌） Vol.136 No.9 （2016） 特集：大電流高エネルギー技術の最新動向

本誌掲載ページ: 741-748 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejpes/136/9/136_741/_article/-char/ja/