Fluctuation of arc plasma in arc plasma torch with multiple cathodes

doi:10.1088/1674-1056/ab344b

Abstract

Fluctuation phenomena commonly exist in arc plasmas, limiting the application of this technology. In this paper, we report an investigation of fluctuations of arc plasmas in an arc plasma torch with multiple cathodes. Time-resolved images of the plasma column and anode arc roots are captured. Variations of the arc voltage, plasma column diameter, and pressure are also revealed. The results indicate that two well-separated fluctuations exist in the arc plasma torch. One is the high-frequency fluctuation (of several thousand Hz), which arises from transferring of the anode arc root. The other is the low-frequency fluctuation (of several hundred Hz), which may come from the pressure variation in the arc plasma torch. Initial analysis reveals that as the gas flow rate changes, the low-frequency fluctuation shows a similar variation trend with the Helmholtz oscillation. This oscillation leads to the shrinking and expanding of the plasma column. As a result, the arc voltage shows a sinusoidal fluctuation.

Keywords: arc fluctuation arc plasma Helmholtz oscillation anode arc root multiple cathodes

Received: 13 June 2019
Revised: 09 July 2019
Accepted manuscript online:

PACS:	52.25.Gj	(Fluctuation and chaos phenomena)
	52.80.Mg	(Arcs; sparks; lightning; atmospheric electricity)
	52.70.Kz	(Optical (ultraviolet, visible, infrared) measurements)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11875256, 11675177, and 11705202) and Anhui Provincial Natural Science Foundation, China (Grant No. 1808085MA12).

Corresponding Authors: Cheng Wang, Weidong Xia
E-mail: awcheng@mail.ustc.edu.cn;xiawd@ustc.edu.cn

Cite this article:

Zelong Zhang(张泽龙), Cheng Wang(王城), Qiang Sun(孙强), Weidong Xia(夏维东) Fluctuation of arc plasma in arc plasma torch with multiple cathodes 2019 Chin. Phys. B 28 095201

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