Experimental Observations of Constricted and Diffuse Anode Attachment in a Magnetically Rotating Arc at Atmospheric Pressure

Wang, Cheng; Sun, Lu; Sun, Qibin; Zhang, Zelong; Xia, Weiluo; Xia, Weidong

doi:10.1007/s11090-019-09954-z

Cited by 18 publications

(15 citation statements)

References 37 publications

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“…Several other studies [13][14][15] showed that the mode of anode attachment (diffused/constricted arc attachment) influences anode erosion rate. Pan Wenxia et al [16][17] found that diffused arc attachment can only be obtained in pure argon and that the addition of a small amount of nitrogen clearly creates constricted arc root attachment and anode erosion.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation into the anode erosion phenomenon in a DC non-transferred arc plasma torch

Sun

Zhu

et al. 2020

Preprint

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Anode erosion phenomenon in a DC non-transferred arc plasma torch was experimentally investigated. Anode weight loss and anode erosion position with changes in plasma current, gas-flow rate and anode length were studied. The results show that all these influences could be explained by plasma power. Anode erosion position was closely related to the structure of anode nozzle and the working conditions of plasma torch. The influence of anode arc root position and the energy flow through it on anode erosion was also analyzed. Moreover, the mechanism of anode erosion and its influence on plasma jet were studied. The results can serve as a reference for revealing the mechanism of plasma discharge, for the optimization design of arc plasma torch, and for high-quality plasma generation.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation into the anode erosion phenomenon in a DC non-transferred arc plasma torch

Sun

Zhu

et al. 2020

Preprint

Self Cite

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“…Therefore, many techniques have been developed to reduce the anode ablation and improve the stability of the arc plasma. These techniques include rotating the arc using an external magnetic field [12][13][14], the use of a multielectrode structure [15,16], and the gas-dynamic dispersion method [17,18].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of argon shielding gas on the suppression of nitrogen arc anode ablation

Hu¹,

Meng²,

Huang³

et al. 2022

J. Phys. D: Appl. Phys.

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The high heat flux density of the DC arc often leads to severe anode ablation, which is a key factor limiting the wider use of the DC plasma torches. In this study, a series of comparative experimental studies are conducted with the goal of suppressing nitrogen arc anode ablation by combining argon shielding flow and anode structure. It is found that for the planar electrode structure, the use of argon shielding gas can alleviate the ablation of the anode by nitrogen arc to some extent. If a boron nitride channel is installed on the anode surface to constrain the argon shielding flow, the electrode ablation can be significantly reduced. The experimental results show that there is no significant ablation on the anode surface after 1 hour of operation of the nitrogen arc device with an arc current of 100 A. Further analysis reveals that, on the one hand, argon shielding gas can extend the range of motion of the nitrogen arc root along the anode surface and increase the speed of arc root motion, which has the effect of expanding the time-averaged arc anode attachment area. On the other hand, argon shielding gas can also increase the size of the nitrogen arc root and decrease the temperature of the arc root. The use of constraining channels can effectively control the range of motion of the arc root along the anode surface and strengthen the influence of argon shielding gas. The combination of these effects can substantially suppress the anode ablation of the DC arc device.

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“…Unfortunately, the gas vortex formation and highly luminous arc can interfere with the experimental elucidation of the arc attachment phenomenon and hence the majority of experimental investigations on the effects of arc rotation are usually conducted with the help of electromagnetic arc rotation. During such an experimental investigation with a magnetically rotated arc, Wang et al [6] observed three kinds of arc attachments, namely, constricted (single), diffuse and multiple (two or more) arc attachments. These three modes of arc attachments were very sensitive to the applied arc current and the strength of the external magnetic field and the constricted arc attachments were favoured at low currents.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the experimental data on arc plasma torches are reported in terms of time traces of voltage drop and planar arc images from a high-speed camera [6,[8][9][10]. Visualization of the axial motion of the arc inside the plasma torch, which may affect the rotational motion, is highly challenging even using the most advanced imaging technology.…”

Section: Introductionmentioning

confidence: 99%

Arc dynamics in a vortex-stabilized non-transferred plasma torch with a tangential gas feed

Perambadur¹,

Shukla²,

Klimenko³

et al. 2021

J. Phys. D: Appl. Phys.

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The mode of anode arc attachments in a thermal plasma torch, such as constricted arc, multi-arc or diffused arc attachment, has operational as well as economic consequences on the use of plasma torches in industrial applications. The mode of arc attachment is strongly dependent on the gas flow dynamics, gas vortex formation and wall energy exchange. To gain more insight into arc attachment behaviour, this article presents a transient flow plasma model implemented using OpenFOAM computational fluid dynamics code to study the effect of gas swirl and arc rotation on modes of arc attachments. A tangentially fed plasma gas creates a gas swirl that helps to induce the arc rotation. The investigations were carried out at arc currents between 200–450 A and input gas flow rates in the range of 5–20 slpm. High gas swirl and low arc currents are found to favour constricted attachment on the anode surface. The local gas vortex driven by the plasma swirl creates hot spots inside the torch that dictate the arc attachment. The transition of arc attachment from the diffuse to constricted mode was simulated by imposing a step-change in the gas flow which shows the evolution of different arc attachment behaviour. During the transition from constricted to diffused attachment, the arc tends to undergo a transitionary multi-attachment mode at specific selected current and flow parameters.

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Experimental Observations of Constricted and Diffuse Anode Attachment in a Magnetically Rotating Arc at Atmospheric Pressure

Cited by 18 publications

References 37 publications

Experimental investigation into the anode erosion phenomenon in a DC non-transferred arc plasma torch

Experimental investigation into the anode erosion phenomenon in a DC non-transferred arc plasma torch

Experimental study on the effect of argon shielding gas on the suppression of nitrogen arc anode ablation

Arc dynamics in a vortex-stabilized non-transferred plasma torch with a tangential gas feed

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