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级联阳极直流等离子体喷枪中基于局部热力学平衡（LTE）和双温度（2-T）电弧模型的阳极电弧附着预测

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

作者信息

Zhukovskii Rodion, Chazelas Christophe, Rat Vincent, Vardelle Armelle, Molz Ron

机构信息

CNRS, IRCER, UMR 7315, Université de Limoges, 87000 Limoges, France.

Oerlikon Metco (US) Inc, Westbury, New York USA.

出版信息

J Therm Spray Technol. 2022;31(1-2):28-45. doi: 10.1007/s11666-021-01253-4. Epub 2021 Sep 9.

DOI:10.1007/s11666-021-01253-4
PMID:38624722
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8428209/
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 post-mortem 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.

摘要

在直流等离子体喷枪中，阳极侵蚀是一个普遍关注的问题。它主要取决于电弧带来的热通量以及电弧附着在阳极壁上给定位置的尺寸和停留时间。后者在很大程度上取决于电弧在阳极壁上的附着方式。本文比较了由LTE（局部热力学平衡）和2-T（双温度）电弧模型预测的阳极电弧附着模式，这两种模型在计算域中都包含电极。研究对象是一种在高电流（500 A）和低气体流量（60 NLPM氩气）下运行的商用级联阳极等离子体喷枪。结果表明，LTE模型预测阳极电弧附着会收缩并在阳极环上移动，而2-T模型预测电弧附着是扩散且稳定的。预测电弧电压与实测电弧电压的比较表明，2-T模型的预测结果更接近实际电压。此外，对在相同条件下短时间运行的实际等离子体喷枪的新阳极环进行的事后观察证实，新阳极上存在扩散的电弧附着。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/27543d4edf8f/11666_2021_1253_Fig18_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/04012249eb22/11666_2021_1253_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/6256bfc180f7/11666_2021_1253_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/efc02d6f4577/11666_2021_1253_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/2cc5b8be4cf1/11666_2021_1253_Fig11_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/e25a54aec76d/11666_2021_1253_Fig15_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ea4/8428209/e359403c9002/11666_2021_1253_Fig16_HTML.jpg
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本文引用的文献

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