Anode attachment stability and anode heat transfer for high-intensity arcs with lateral gas flow
Anode attachment stability and anode heat transfer for high-intensity arcs with lateral gas flow
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DOI：
10.1109/tps.2005.848608
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发表时间：
2005-06
影响因子：
1.5
通讯作者：
T. Iwao;P. Cronin;D. Bendix;J. Heberlein
中科院分区：
文献类型：
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作者：
T. Iwao;P. Cronin;D. Bendix;J. Heberlein
这项研究确定了阳极附件的运动和热通量的阳极的配置，其中弧轴是垂直于阳极表面的等离子体气体沿沿着弧轴流动，并与不同的气体平行于阳极表面的横向注入。除了10 mm的间隙之外，电弧由收缩器稳定，电弧电流为75和100 A，等离子体气体流速为5 slm的氩气，横向气体流速为0至25 slm，横向注入氩气、氮气或氦气。高速摄像和量热测量的阳极冷却水的温度增加被用来表征阳极附着。结果表明，阳极附着存在不同的模式，包括一个稳定的偏转阳极根部，一个随机波动的附着，和一个周期性波动的附着。当阳极斑点出现时，侧向气体产生弧压升高。阳极总传热量随横向气体流量和附着方式的不同而变化。这种效应的发生可能是因为横向气流导致从电弧到腔室壁的对流热损失。
This study determined the motion of an anode attachment and the heat flux to the anode for a configuration in which the arc axis is perpendicular to the anode surface with the plasma gas flowing along the arc axis, and with lateral injection of different gases parallel to the anode surface. The arc is stabilized by a constrictor except for a gap of 10 mm, the arc currents are 75 and 100 A, the plasma gas flow rate is 5 slm of argon, and the lateral gas flow rate is 0 to 25 slm, with argon, nitrogen, or helium gas that is injected laterally. High-speed videography and calorimetric measurements of the anode cooling water temperature increase are used to characterize the anode attachment. Results show that different modes of anode attachment exist, including a steady deflected anode root, a randomly fluctuating attachment, and a periodically fluctuating attachment. When the anode spot appears, the lateral gas produces an arc voltage increase. The total anode heat transfer changes with different lateral gas flow rates and for different attachments modes. This effect probably occurs because lateral gas flow causes a convective heat loss from the arc to the chamber walls.