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<p>A three-dimensional transient fully non-equilibrium numerical simulation is developed to study the dynamic attachment process of arc roots in planar anode arc discharge under side-blowing gas flow. The results indicate that under the conditions of an arc current of 50 A and a side-blowing gas flow rate of 15 slm, the planar anode exhibits arc restrike phenomena with a frequency of 75&#xa0;Hz, which is close to the experimental results. Under the influence of gas dynamic forces that intersect with the direction of the arc attachment, the arc voltage continuously increases and lengthens as the arc moves downstream toward the cathode, leading to a rapid increase in the upstream electric field. The increase in the electric field and current density enhances the electric field heating process, subsequently triggering arc restrike. After breakdown, the current density increases rapidly, the arc attachment position shifts from downstream to upstream, the arc length and arc voltage decrease, and the voltage curve exhibits a sawtooth distribution. During restrike, the anode arc root jumps at high speed (∼10&#xa0;m/s), and after breakdown, it slides slowly (∼1&#xa0;m/s). In the upstream cold boundary layer where the anode arc root is attached, ionization reactions exceed recombination reactions, with stepwise ionization reactions involving excited-state argon atoms being dominant, and the ions present are mainly argon atomic ions. However, after the arc root cools and until the next breakdown occurs, the ions in the cold boundary layer are primarily argon molecular ions, with dissociative recombination reactions related being dominant. Increasing the gas flow rate causes the arc root attachment area to move downstream, while the breakdown frequency raises; increasing the arc current increases the breakdown frequency, but the arc root attachment position during restrike is more upstream. </p>

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Three-dimensional numerical simulation on the restrike mode of a DC arc anode attachment

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Hai-Xing Wang,
  • Jang-Hong Sun,
  • Ao-Wei Liu,
  • Su-Rong Sun

摘要

A three-dimensional transient fully non-equilibrium numerical simulation is developed to study the dynamic attachment process of arc roots in planar anode arc discharge under side-blowing gas flow. The results indicate that under the conditions of an arc current of 50 A and a side-blowing gas flow rate of 15 slm, the planar anode exhibits arc restrike phenomena with a frequency of 75 Hz, which is close to the experimental results. Under the influence of gas dynamic forces that intersect with the direction of the arc attachment, the arc voltage continuously increases and lengthens as the arc moves downstream toward the cathode, leading to a rapid increase in the upstream electric field. The increase in the electric field and current density enhances the electric field heating process, subsequently triggering arc restrike. After breakdown, the current density increases rapidly, the arc attachment position shifts from downstream to upstream, the arc length and arc voltage decrease, and the voltage curve exhibits a sawtooth distribution. During restrike, the anode arc root jumps at high speed (∼10 m/s), and after breakdown, it slides slowly (∼1 m/s). In the upstream cold boundary layer where the anode arc root is attached, ionization reactions exceed recombination reactions, with stepwise ionization reactions involving excited-state argon atoms being dominant, and the ions present are mainly argon atomic ions. However, after the arc root cools and until the next breakdown occurs, the ions in the cold boundary layer are primarily argon molecular ions, with dissociative recombination reactions related being dominant. Increasing the gas flow rate causes the arc root attachment area to move downstream, while the breakdown frequency raises; increasing the arc current increases the breakdown frequency, but the arc root attachment position during restrike is more upstream.