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Communication Dans Un Congrès Année : 2007

3D modelling of the cathodic arc root movement in a hollow cathode of a thermal plasma torch

Résumé

This paper deals on a 3D unsteady model of an arc in a hollow cathode. In this kind of configuration the gas is injected in vortex, and an external magnetic field is used to produce an arc root movement to diminish the cathode erosion. A 3D model is developed based on the @Fluent software and a physical approach proposed to describe the arc root positions in time following the plasma characteristics. The mathematical developments take in account all the hydrodynamic plasma description and the electromagnetic effects due to the auto induced magnetic field and to the external one. Results are presented in case of an air plasma and a current intensity equal to 260A with an injected mass flow rate of 20g/s. After the presentation of the plasma characteristics in term of temperature, velocity, magnetic field, the obtained mean arc root position is compared to experimental one, and the arc root velocity to literature values deduced from empirical law.
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Dates et versions

hal-03884727 , version 1 (05-12-2022)

Identifiants

  • HAL Id : hal-03884727 , version 1

Citer

Pierre Freton, Jean-Jacques Gonzalez, Alain Gleizes, D. Conte. 3D modelling of the cathodic arc root movement in a hollow cathode of a thermal plasma torch. ICPIG 2007 : XXVIII International Conference on Phenomena in Ionized Gases, Prague Czech republic, 2007, Prague, Czech Republic. pp.1770-1773. ⟨hal-03884727⟩
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