Three-Dimensional Unsteady MHD Modeling of a Low-Current High-Voltage Nontransferred DC Plasma Torch Operating With Air

Lebouvier, Alexandre; Delalondre, C.; Fresnet, F.; Boch, Valérie; Rohani, Vandad; Cauneau, François; Fulcheri, Laurent

doi:10.1109/tps.2011.2160208

Cited by 37 publications

(15 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This section shows results for a typical operating point and the comparison with quantitative and qualitative experimental results. This section points also out the main differences between the vortex and axial injection developed in a previous model [9]. Figure 7 shows the experimental and numerical oscillograms for the reference case.…”

Section: 2mentioning

confidence: 74%

“…The model presented below has already been detailed in ref. [9] for the study of the quasi-continuous mode of the low current plasma torch with an axial injection. We will emphasize in this paper the main characteristics of the model.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…For several years, the Center for Energy and Processes (CEP) study the plasma-assisted conversion of heavy hydrocarbons like diesel fuel [3], gasoline [4], ethanol [5], both experimentally and numerically [6][7][8]. More recently, the CEP has developed a non-reactive MHD model of his low current -high voltage rotating arc reactor to investigate the quasi-continuous behaviour of the arc discharge operating with air [9]. However, in rotating arc reactors, the arc behaviour can be similar to a gliding arc reactor [10] in certain conditions of current and mass flow rate due to the stretching of the arc column.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Lebouvier¹,

Delalondre²,

Fresnet³

et al. 2011

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

Section: 2mentioning

confidence: 74%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Lebouvier¹,

Delalondre²,

Fresnet³

et al. 2011

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…In some studies [44,45], the modeling of plasma torch is treated as a laminar flow. However, the number of studies [46][47][48] considered plasma flow as turbulent. It should be noted that, in DC arc plasma torches, sudden heating of projected gas in the nozzle cause change in the acceleration due to the expansion of gas, thereby making the flow turbulent.…”

Section: Governing Flow Equationsmentioning

confidence: 99%

Modeling and Analysis of Shock Reduction through Counterflow Plasma Jets

Rashid

Nawaz

Maqsood

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

The study presents a numerical investigation of aerodynamic drag reduction by implementing a counterflow plasma jet, emanating from the stagnation point of an aerodynamic surface in a supersonic regime with a constant pressure ratio PR = 3 , and compares findings with a conventional opposing jet. The computational study is carried out by solving three-dimensional and axisymmetric Navier–Stokes equations for counterflow plasma-jet interaction. The calculations are performed at free-stream Mach ( M ∞ = 1.4) with sea level stagnation conditions. The weakly ionized argon plasma jet generated by a plasma torch has constant stagnation pressure and temperature of 303,975 Pa and 3000 K . The effect of the Mach number and the angle of attack variation on plasma-jet effectiveness is also analyzed. The results indicate that the counterflow plasma jet reduces more drag (in twice) compared to the conventional jet (nonplasma). The gravitational, magnetic field effect and chemical processes in the plasma formation are considered negligible. It is inferred that the effectiveness of the counterflow plasma jet strongly depends upon the jet stagnation temperature.

show abstract

“…Although the most relevant papers presenting the MHD algorithms do not mention the time required for computation, the time needed to solve one step calculation can be compared with the results of Lebouvier et al 29) and Rehmet et al 30) in order to demonstrate the difference between computation times. Lebouvier et al 29) utilized MHD models for DC plasma torch. The model was implemented in Code_Saturne software, installed on eight processors (Intel Xeon 2.66 GHz).…”

Section: Computational Demandmentioning

confidence: 99%

Low Computational-complexity Model of EAF Arc-heat Distribution

et al. 2015

View full text Add to dashboard Cite

The paper presents a computational model and the corresponding algorithm for estimating the arc energy distribution to conductive, convective and radiative heat transfer in an electric arc furnace (EAF). The proposed algorithm uses channel arc model (CAM) in order to compute the distribution of the arc energy through empirical equations (to approximate arc radius), ideal gas law (to approximate arc density) and results of magneto-hydro-dynamic (MHD) models (to approximate arc pressure, temperature and velocity). Results obtained using the proposed algorithm are comparable with other similar studies; however, in contrast to other arc-energy distribution models, this model requires only two input variables (arc length and arc current) in order to calculate the energy distribution. Furthermore, simple algebraic equations used in the algorithm ensure minimal computational load and consequently lead to short calculation times which are approximately one hundred thousand (100 000) times smaller than solving the MHD model equations, making the algorithm suitable for real-time applications, such as smart monitoring and model-based control. The algorithm has been validated by two different approaches. First, the simulation results have been compared to a study dealing with arc-heat distribution in plasma arc furnace; and second, the proposed arc module has been integrated into the frame of a comprehensive EAF model in order to estimate the EAF temperature levels and compare them with operational EAF measurements. Both validations show high levels of similarity with the comparing data.KEY WORDS: arc current; arc heat distribution; arc length; channel arc model; EAF.approximately 75-85% of the total energy in low to medium power furnaces and approximately 50-60% of the total energy in ultra-high power furnaces (UHP).3) Implementing an accurate arc module in a comprehensive model-based EAF control, which ensures optimal control of arc length and slag height can lead to substantial energy saving and associated cost reduction. If a total energy reduction in a 200 ton UHP EAF with approximate annual production of 675 000 tones is 50 kWh/ton, with an assumption of 25 kWh/ton being the electrical energy, with the price of 10 $Cent/kWh, total annual energy savings will be equivalent to 1.7 million $ per year.It is known that the heat generated by the arcs is dissipated into the furnace by all three mechanisms of heat transfer (convection, conduction and radiation); however, the amount of the heat, transferred by each mechanism varies according to several factors, such as arc length, arc current, slag height, stage of melting etc. Development of a computational model of the arc, which allows estimation of the arc-heat distribution should therefore include all three types of heat transfer mechanisms, which can also be used to obtain the overall energy balance of the EAF. Application of such models may provide appropriate tools for optimizing the energy flow or use of model-based control systems in the EAFs.

show abstract

Three-Dimensional Unsteady MHD Modeling of a Low-Current High-Voltage Nontransferred DC Plasma Torch Operating With Air

Cited by 37 publications

References 42 publications

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

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

Modeling and Analysis of Shock Reduction through Counterflow Plasma Jets

Low Computational-complexity Model of EAF Arc-heat Distribution

Contact Info

Product

Resources

About