Investigation and control of dc arc jet instabilities to obtain a self-sustained pulsed laminar arc jet

Joanna Krowka 1 Vincent Rat 1 Jean-François Coudert 1
1 Axe 2 : procédés de traitements de surface
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
Abstract : The uncontrolled arc plasma instabilities in suspension plasma spraying or solution precursor plasma spraying cause non-homogeneous plasma treatments of material during their flight and also on coatings during their formation. This paper shows that the arc motion in dc plasma torches mainly originates in two main modes of oscillation (Helmholtz and restrike modes). The emphasis is put on the restrike mode in which the time component is extracted after building up and applying a numerical filter to raw arc voltage signals. The dependence of re-arcing events on experimental parameters is analysed in the frame of a phenomenological restrike model. It is shown that when the restrike frequency reaches the Helmholtz one, both modes are locked together and a pulsed arc jet is generated.
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Soumis le : jeudi 13 février 2014 - 16:37:56
Dernière modification le : mercredi 14 février 2018 - 16:29:36

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Joanna Krowka, Vincent Rat, Jean-François Coudert. Investigation and control of dc arc jet instabilities to obtain a self-sustained pulsed laminar arc jet. Journal of Physics D: Applied Physics, IOP Publishing, 2013, 46, pp.505206. ⟨10.1088/0022-3727/46/50/505206⟩. ⟨hal-00946568⟩

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