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

Gueye, Papa; Cressault, Yann; Rohani, Vandad-Julien; Fulcheri, Laurent

doi:10.1088/1361-6463/aaff3c

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…where J q is the electric current density (A m −2 ) and σ q is the electric conductivity (S•m −1 ). The electric conductivity σ q is obtained as a function of pressure and temperature based on [16], whereas J q is obtained using Ohm's law (8):…”

Section: Numerical Strategymentioning

confidence: 99%

“…More generally, numerical methods must be adapted to address the peculiarities of arc discharges in computational fluid dynamics (CFDs) codes. A widely used approach to model thermal equilibrium plasmas is the resistive magnetohydrodynamics approach (MHD) [8]. This approach has the advantage of being computationally fast because it allows spatial and temporal discretizations compatible with classical CFD and reactive flow simulations in combustion chambers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical model of restrikes in gliding arc discharges

Bourlet,

Tholin,

Labaune

et al. 2024

Plasma Sources Sci. Technol.

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Direct current (DC) electric arcs are of particular interest because they can produce large volumes of thermal plasmas with controlled energy deposition. When such discharges are applied in a gas flow, convection displaces the top of the arc downstream while the arc roots remain attached to the electrodes, thus increasing the length of the arc over time. However, this growth is limited by a restrike phenomenon, which starts from streamers appearing in high electric field regions and shortcutting the long, stretched electric arc. From a numerical point of view, DC arcs can be efficiently simulated with a resistive magneto-hydrodynamics (MHD) model, with numerical requirements in terms of spatial and temporal discretization that are compatible with classic fluid dynamics and combustion simulations. However, arc restrikes rely on the propagation of streamer discharges that are highly non-neutral phenomena, whereas classical MHD assumes neutrality. To tackle this problem, we propose in this paper a model of restrike that can be used in an MHD approach. After describing the ideas of the model, we perform a parametric study of the input parameters to examine its influence on the discharge dynamics.

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Section: Numerical Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical model of restrikes in gliding arc discharges

Bourlet,

Tholin,

Labaune

et al. 2024

Plasma Sources Sci. Technol.

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show abstract

“…Typical applications can be found in low-voltage switching devices, plasma torches with rotating arcs, electric arc welding, lightning direct effect test, etc. (Tanaka et al, 2010;Baeva and Uhrlandt, 2011;Abdelal and Murphy, 2017;Gueye et al, 2019). In dynamic lightning sweeping arcs, the MHD theory needs to couple with the aerodynamic force induced by the aerodynamic flow, which is calculated based on the position where the plasma arc segment is situated and also the relative angle of attack.…”

Section: Introductionmentioning

confidence: 99%

Influence of the aerodynamic flow on the dynamic characteristics of a lightning sweeping arc

Xiao

Liu²

2023

Front. Astron. Space Sci.

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Lightning arc attachments during swept strokes are key information in the lightning protection design of fast-moving aircraft, wind turbines, rockets, etc. However, numerical modeling has not achieved success to predict the movement of lightning sweeping arcs due to the limited understanding of the complex multi-physics convolution in the arc fluid at present. This work builds a dynamic magneto-hydrodynamic (MHD) arc model based on the setup in the laboratory simulation of the lightning continuing current and couples the electric–magnetic–thermal–force processes to get insights into the lightning arc dynamics. The MHD theory and Newton’s second law of motion are also incorporated to describe the movement of arc segments in the conditions of aerodynamic flows with different intensities. Results show that, at the center region of the arc, the electromagnetic force, thermal buoyancy, and aerodynamic force are competitive, and all are determiners in predicting the arc displacement. In contrast, at the root region of the arc, the electromagnetic force dominates the arc movement with a flow speed under 10 m/s, while aerodynamic force takes the dominant role when the flow speed exceeds 50 m/s. The arc sweeping distance expands from 0.02 to 1.01 m as the aerodynamic flow increases from 5 to 200 m/s. Meanwhile, when increasing the pitch angle of the arc-connected surface, the arc root becomes more attached to the surface and the sweeping distance is predicted to get reduced. The conclusions offer references to construct a numerical model and predict the complex arc movement during lightning sweeping strokes.

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“…More more generally, numerical methods must be adapted to address the peculiarities of arc discharges in CFD codes. A widely used approach to model thermal equilibrium plasmas is the resistive magneto-hydrodynamics approach (MHD) [10,13]. This approach has the advantage of being computationally fast because it allows spatial and temporal discretizations compatible with classical CFD and reactive flow simulations in combustion chambers.…”

Section: Introductionmentioning

confidence: 99%

Numerical model of restrikes in DC gliding arc discharges

Bourlet

Labaune

Tholin

et al. 2022

AIAA SCITECH 2022 Forum

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Plasma-assisted combustion (PAC) is a promising technology that could lead to a breakthrough in propulsion systems. Many plasmas can be used for such applications. Among them, DC electric arcs are interesting because they can produce large volumes of thermal plasmas with controlled energy deposition. When such discharges are applied in a gas flow, convection entrains the head of the arc downstream while its feet remain attached to the electrodes, thus increasing the length of the arc over time. However, this growth is limited by a restrike phenomenon, which starts from streamers appearing in high electric field regions and shortcutting the long, stretched electric arc. From a numerical point of view, DC arcs can be efficiently simulated with a resistive magneto-hydrodynamics (MHD) model, with numerical requirements in terms of spatial and temporal discretization that are compatible with classic CFD and combustion simulations. However, arc restrikes rely on the propagation of streamer discharges that are highly non-neutral phenomena, whereas classical MHD assumes neutrality. To tackle this problem, we propose in this paper a model of restrike that can be used in an MHD approach. The model is based on the current knowledge about the physics of streamer discharges. After the description of the core ideas of the model, we perform a parametric study of the input parameters to examine the influence in the discharge dynamics.

show abstract

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

Cited by 6 publications

References 43 publications

Numerical model of restrikes in gliding arc discharges

Numerical model of restrikes in gliding arc discharges

Influence of the aerodynamic flow on the dynamic characteristics of a lightning sweeping arc

Numerical model of restrikes in DC gliding arc discharges

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