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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Comparison of thermal and electric characteristic for free-burning arc using coupled and decoupled sheath models
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Comparison of thermal and electric characteristic for free-burning arc using coupled and decoupled sheath models

机译：使用耦合和解耦鞘型比较自由燃烧弧的热电特性

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摘要

A comparison of coupled and decoupled sheath models is performed to study the interaction between the arc column and the near cathode layer in this paper. The coupled model used in this paper is modified based on the previous work. The thermal conductions of the heavy particles and electrons between the arc column and the near cathode layer are added to the energy transport equation in the model, which is different from the decoupled model of cathode sheath and arc column. The simulation shows that: (1) The energy (due to thermal conductions) delivered from the arc column to the near cathode layer is always positive, and it increases as arc currents increase. (2) Compared with the decoupled model for free-burning arc (20-200 A currents) at the diffuse mode of the cathodic attachment, the total arc voltage of the coupled model is closer to the value of experiment. (3) The voltage drop of the near cathode layer calculated by the coupled mode is always lower than that calculated by the decoupled model. The differences increase as the arc current increases. The voltage drop of arc column calculated by the coupled mode is lower than that calculated by the decoupled model at low current, and the situation is opposite at high current. (4) The current distribution of coupled model along the cathode surface is more uniform. In additional, we compare our coupled model with another coupled sheath model. The results from the two coupled sheath models are in good agreement in high currents.
机译：进行耦合和去耦鞘型模型的比较以研究本文中的电弧柱和近阴极层之间的相互作用。本文使用的耦合模型基于以前的工作来修改。在模型中的电弧柱和近阴极层之间的重质颗粒和电子之间的热传导和近阴极层之间的热量，这与阴极护套和弧柱的去耦模型不同。模拟表明：（1）从电弧柱输送到近阴极层的能量（由于热传导）总是肯定的，随着电弧电流的增加，它增加。 （2）与阴极连接的漫射模式下的可用燃烧弧（20-200电流）的去耦模型相比，耦合模型的总电弧电压更接近实验的值。 （3）通过耦合模式计算的近阴极层的电压降总是低于通过解耦模型计算的近阴极层。随着电弧电流的增加，差异增加。由耦合模式计算的电弧柱的电压降低于低电流下解耦模型计算的电弧柱，并且情况在高电流相反。 （4）沿阴极表面的耦合模型的电流分布更均匀。在额外，我们将我们的耦合模型与另一个耦合的护套模型进行比较。两个耦合护套模型的结果在高电流方面处于良好的一致性。

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