Properties of arc discharge with hybrid stabilization

Properties of arc discharge with hybrid stabilization

Článek recenzovaný mimo WoS a Scopus

Processes in the worldwide unique type of thermal plasma generator with water vortex stabilization and combined stabilization of arc by argon flow and water vortex have been numerically studied. Two-dimensional axisymmetric numerical model assumes laminar and compressible plasma flow in the state of local thermodynamic equilibrium. Radiation losses from the arc are involved by the partial characteristics methods for atmospheric pressure water and argon-water discharges. The aim of this paper is to study the impact of different physical and numerical assumptions on the overall arc performance. The following problems have been studied: 1) the change of arc parameters with the density of numerical grid, 2) the influence of the first and second order density differencing on the calculated results, 3) the impact of pressure-dependence of radiation losses and plasma density on arc parameters. Numerical experiments proved that results obtained with the grids denser than 60 x 40 points in the axial and radial directions respectively are practically grid-independent. Results carried out with the more accurate second order density differencing at the main control volumes faces are within 7 % of our previously published results. The dependence of radiation losses and plasma density on pressure influences mainly plasma velocity and power losses from the arcs.

Processes in the worldwide unique type of thermal plasma generator with water vortex stabilization and combined stabilization of arc by argon flow and water vortex have been numerically studied. Two-dimensional axisymmetric numerical model assumes laminar and compressible plasma flow in the state of local thermodynamic equilibrium. Radiation losses from the arc are involved by the partial characteristics methods for atmospheric pressure water and argon-water discharges. The aim of this paper is to study the impact of different physical and numerical assumptions on the overall arc performance. The following problems have been studied: 1) the change of arc parameters with the density of numerical grid, 2) the influence of the first and second order density differencing on the calculated results, 3) the impact of pressure-dependence of radiation losses and plasma density on arc parameters. Numerical experiments proved that results obtained with the grids denser than 60 x 40 points in the axial and radial directions respectively are practically grid-independent. Results carried out with the more accurate second order density differencing at the main control volumes faces are within 7 % of our previously published results. The dependence of radiation losses and plasma density on pressure influences mainly plasma velocity and power losses from the arcs.

arc, hybrid (water) discharge, partial characteristics, upwind, grid

arc, hybrid (water) discharge, partial characteristics, upwind, grid

JENIŠTA, J.; BARTLOVÁ, M.; AUBRECHT, V.

01.05.2006

1093-3611

HIGH TEMPERATURE MATERIAL PROCESSES

10

4

Spojené státy americké

501

13