A novel experimental method of investigating anode arc root was presented, and a plasma torch with multiple anodes was designed. With this apparatus, the number of anode arc roots, their position, and movement with changes in plasma current and gas-flow rate were studied. Results showed that multiple anode arc roots can coexist and their number was more related to plasma current than gas-flow rate. The number of anode arc roots increased with increased plasma current. The anode arc root can move forward and backward in the arc plasma jet, and its position was related to current and gas-flow rate. The anode arc root moved forward with increased current, whereas the anode arc root moved forward first and backward with increased gas-flow rate. Based on the finding, a new non-transferred arc model was established. Finally, the anode arc root motion was classified as steady, slight vibration, alternating motion, jumping motion, and multiple arc root modes. These results can serve as ...

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研究直流非转移电弧等离子体炬中阳极-电弧根行为的新实验方法

提出了研究阳极弧根的新实验方法，并设计了具有多个阳极的等离子炬。使用该设备，研究了阳极电弧根的数量，它们的位置以及随着等离子电流和气体流速的变化而运动。结果表明，多个阳极电弧根可以共存，其数量与等离子体电流的关系比与气体流速的关系更大。阳极电弧根的数量随着等离子体电流的增加而增加。阳极电弧根在电弧等离子体射流中可以前后移动，其位置与电流和气体流速有关。阳极弧根随着电流的增加而向前移动，而阳极弧根随着气体流量的增加而先向后移动。基于此发现，建立了一个新的非转移弧模型。最后，阳极电弧根运动可分为稳定，轻微振动，交替运动，跳跃运动和多种电弧根模式。这些结果可以用作...