Investigation of Arc Behavior and Temperature Distribution Corresponding to Electrode and Phase Configurations in a Multiphase AC Arc

Takafumi Okuma, Hiroki Maruyama, Tomoyuki Imatsuji, Taro Hashizume, Hisao Nagai, Takeshi Koiwasaki, Manabu Tanaka, Takayuki Watanabe

Research output: Contribution to journalArticle

Abstract

<p>Effects of electrode and phase configurations on arc behavior and temperature distribution in a multiphase AC arc were successfully clarified. A high-speed video camera with band-pass filters were addressed to measure the arc. A multiphase AC arc is promising material processing technology owing to the characteristics of large high-temperature volume and high energy efficiency. The arc behavior was observed by imaging arc discharge with a high-speed camera in millisecond time scale. The temperature was conducted by Boltzmann plot method using two types of argon line emissions filtered by the band-pass filters. The obtained excitation temperature is high with a range of 7.0×10<sup>3</sup> to 1.3×10<sup>4</sup> K. The arc swing in front of electrode becomes wider and the temperature uniformity improves as the number of electrodes and phases increase. The characteristic time due to fluctuation of 12-phase AC arc was 1.4 ms, which was sufficiently shorter than the residence time of raw material in the arc. The 12-phase AC arc is useful for material processing in terms of temperature uniformity and fluctuation time.</p>
Original languageEnglish
Pages (from-to)509-515
Number of pages7
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume53
Issue number9
DOIs
Publication statusPublished - Sep 2020

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