International audienceMost arc plasma systems are based on DC plasma technologies. However AC plasma systems can offer significant advantages versus DC plasma systems particularly in terms of efficiency, cost and reliability. They are also likely to overcome some of the limits of classical DC systems for some specific large scale high power applications. This paper presents a literature review of three-phase AC plasma systems which have been developed by the most active research groups on multi-phase AC plasma systems in the United States, Norway, Germany, Russia, France, and Japan for about 50 years
International audienceThis computational fluid dynamics work is dedicated to the study of heat and mass transfer in a new 100-kW three-phase ac/50 Hz plasma torch operating with air. The transient behavior of the arc is simplified using time-averaged heat and momentum source inputs in a stationary source volume whose form was chosen according to the results from a separate magnetohydrodynamic calculation. A parametric study of source volume and momentum intensity is conducted and shows a little influence on the overall temperature and velocity fields. Radiation from gas and walls is taken into account using the discrete ordinate model. Air radiation data consider both atomic and molecular contributions in the temperature range between 300 and 30 000 K and for the wavelengths from 0.209 \mu text{m} to the far infrared. The results show a huge impact of radiation on wall temperature and heat losses. Two different methods, Planck and Rosseland, are used for the calculation of mean absorption coefficients. Although Planck’s average is recommended in this case, the absolute temperature difference between both averages is below 13%. Finally, this paper allows checking that the temperature of different components of plasma torch remains below the physical limits of the selected materials
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