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Predicted Anode Arc Attachment by LTE (Local Thermodynamic Equilibrium) and 2-T (Two-Temperature) Arc Models in a Cascaded-Anode DC Plasma Spray Torch

Rodion Zhukovskii 1 Christophe Chazelas 1 Vincent Rat 1 Armelle Vardelle 1 Ron Molz 1 
1 IRCER-AXE2 - IRCER - Axe 2 : procédés plasmas et lasers
IRCER - Institut de Recherche sur les CERamiques : AXE2
Abstract : In DC plasma spray torches, anode erosion is a common concern. It mainly depends on the heat flux brought by the arc and on the dimensions and residence time of the arc attachment to a given location on the anode wall. The latter depend, to a great extent, on the attachment mode of the arc on the anode wall. This paper compares the anode arc attachment modes predicted by an LTE (Local Thermodynamic Equilibrium) and 2-T (two-temperature) arc models that include the electrodes in the computational domain. It deals with a commercial cascaded-anode plasma torch operated at high current (500 A) and low gas flow rate (60 NLPM of argon). It shows that the LTE model predicted a constricted anode arc attachment that moves on the anode ring, while the 2-T model predicted a diffuse and steady arc attachment. The comparison between the predicted and measured arc voltage showed that the 2-T prediction is closer to the actual voltage. Also, the postmortem observation of a new anode ring of the actual plasma torch operated under the same conditions for a short time confirmed a diffuse arc attachment on a new anode. Keywords atmospheric plasma spray (APS) Á torch modeling Á computational fluid dynamics Á electric arc model Á heat transfer This article is an invited paper selected from presentations at the 2021 International Thermal Spray Conference, ITSC2021, that was held virtually May 25-28, 2021 due to travel restrictions related to the coronavirus (COVID-19) pandemic. It has been expanded from the original presentation.
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Submitted on : Friday, November 26, 2021 - 7:00:40 PM
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Rodion Zhukovskii, Christophe Chazelas, Vincent Rat, Armelle Vardelle, Ron Molz. Predicted Anode Arc Attachment by LTE (Local Thermodynamic Equilibrium) and 2-T (Two-Temperature) Arc Models in a Cascaded-Anode DC Plasma Spray Torch. Journal of Thermal Spray Technology, In press, ⟨10.1007/s11666-021-01253-4⟩. ⟨hal-03452299⟩



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