3D MHD modelling of low current–high voltage dc plasma torch under restrike mode

Lebouvier, Alexandre; Delalondre, C.; Fresnet, F.; Cauneau, François; Fulcheri, Laurent

doi:10.1088/0022-3727/45/2/025204

Cited by 21 publications

(9 citation statements)

References 18 publications

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“…One group of researchers believes that space-charge effects on refractory cathodes are small and contribute to the arc voltage by no more than 1 or 2 V. Accordingly, these researchers use simulation models, which are based on the assumption of quasi-neutrality, or an even stronger assumption of local thermodynamic equilibrium (LTE), in the whole arc volume, which means neglect of all space-charge sheaths, e.g. [1][2][3][4][5][6][7][8][9][10][11][12]. Other researchers believe 3 Author to whom any correspondence should be addressed.…”

Section: No-sheath Versus Sheath-accounted Approaches To Modelling Of...mentioning

confidence: 99%

Sheath and arc-column voltages in high-pressure arc discharges

Benilov

Benilova

et al. 2012

J. Phys. D: Appl. Phys.

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Electrical characteristics of a 1 cm-long free-burning atmospheric-pressure argon arc are calculated by means of a model taking into account the existence of a near-cathode space-charge sheath and the discrepancy between the electron and heavy-particle temperatures in the arc column. The computed arc voltage exhibits a variation with the arc current I similar to the one revealed by the experiment and exceeds experimental values by no more than approximately 2 V in the current range 20-175 A. The sheath contributes about two-thirds or more of the arc voltage. The LTE model predicts a different variation of the arc voltage with I and underestimates the experimental values appreciably for low currents but by no more than approximately 2 V for I 120 A. However, the latter can hardly be considered as a proof of unimportance of the space-charge sheath at high currents: the LTE model overestimates both the resistance of the bulk of the arc column and the resistance of the part of the column that is adjacent to the cathode, and this overestimation to a certain extent compensates for the neglect of the voltage drop in the sheath. Furthermore, if the latter resistance were evaluated in the framework of the LTE model in an accurate way, then the overestimation would be still much stronger and the obtained voltage would significantly exceed those observed in the experiment.

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Section: No-sheath Versus Sheath-accounted Approaches To Modelling Of...mentioning

confidence: 99%

Sheath and arc-column voltages in high-pressure arc discharges

Benilov

Benilova

et al. 2012

J. Phys. D: Appl. Phys.

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“…According to the author, they indicate the existence of the phenomenon of resonances occurring in the capacitance and inductance circuit. Their thorough analysis can be useful in improving models of arc discharge and plasma, e.g., modelling of the gliding arc behaviour of a plasma torch or plasma reactor operating with air under low current and high voltage conditions [31][32][33].…”

Section: Discussionmentioning

confidence: 99%

Chosen Aspects of the Electromagnetic Compatibility of Plasma Reactors with Gliding Arc Discharges

Mazurek

2020

Applied Sciences

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This paper presents an analysis of electromagnetic disturbance interactions inside the three-phase gliding arc plasma generation installation. This is the main part of the electromagnetic compatibility analysis of the reactor installation. All elements of the nonthermal plasma installation are described from the point of view of disturbance generation and their influence on the power supply system. The analysis is based on the results of tests carried out in accordance with the guidelines of the electromagnetic compatibility (EMC) Directive and harmonised standards. The disturbances measured are large, over 20 dB above the limits. The disturbances measured allow valid conclusions to be reached in relation to this type of installation. The implication is the need for plasma reactors designed with elements that reduce radiated and conducted interference.

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“…The condition of arc breakdown is still when the electric field overcomes a specified threshold value E b , in a cell of the computational mesh. But, on the contrary of plasma spraying torches, the location of breakdown is extended to the whole domain rather than its strict restriction to the cold gas boundary layer [44,45] . Therefore, the condition is no longer on the electric field between the arc fringes and the anode wall.…”

Section: Arc Breakdown Value With Restrike Modelmentioning

confidence: 99%

MHD modeling of rotating arc under restrike mode in ‘Kvaerner-type’ torch: part I. Dynamics at 1 bar pressure

Gueye¹,

Cressault²,

Rohani³

et al. 2019

J. Phys. D: Appl. Phys.

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This paper focuses on the 3D MHD modeling of an arc plasma at industrial level; the torch is a 'Kvaerner-type' one, made of two concentric graphite electrodes and where spots are displaced with an external magnetic field. Different phenomenologies in arc movement were observed, ranging from a gliding arc on electrodes surfaces to hopping arc foots, agreeing with previous experimental works at atmospheric pressure. These dynamics have non-negligible consequences in the plasma process: the hopping mode induces more erosion due to a higher heat flux at the electrodes surfaces in comparison to the gliding arc; the latter mode results also in a strong gas swirling inside the torch, thus longer particles residence time is predicted.

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3D MHD modelling of low current–high voltage dc plasma torch under restrike mode

Cited by 21 publications

References 18 publications

Sheath and arc-column voltages in high-pressure arc discharges

Sheath and arc-column voltages in high-pressure arc discharges

Chosen Aspects of the Electromagnetic Compatibility of Plasma Reactors with Gliding Arc Discharges

MHD modeling of rotating arc under restrike mode in ‘Kvaerner-type’ torch: part I. Dynamics at 1 bar pressure

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