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Accueil > Groupes de Recherche > Arc Electrique et Procédés Plasmas Thermiques

Research axes

par Yann Cressault - publié le , mis à jour le

1. Basic properties of plasmas

The study and the calculation of the basic properties of thermal plasmas such as composition, thermodynamic properties, transport coefficients, chemical kinetics and radiative transfer are essential for the development of hydrodynamic models and for the implementation of some diagnostic methods (emission spectroscopy, absorption,...). These data are calculated by different approaches within the team and tabulated for gases and gas mixtures sowed or not by metallic vapours, depending on their relative proportion, on temperature and on pressure.

2. Plasma flow

Works relative to the study of plasma flows in the presence of an electric arc are listed under this theme. We are interested in the movements of the whole plasma (convective effects, pumping of surrounding gas, turbulence phenomena). Those studies are realized by the development of codes or the use of commercial software (Fluent), for gases or gas mixtures sowed or not of metal vapors. Our studies are systematically confronted and/or validated by confrontations with experimental results issued from the literature or obtained within the AEPPT team.

3. Plasma-surface interaction

Because of the high flows of energy reached (superior to 106 W / m2 in the presence of an arc), the interaction plasma-surface plays an essential role within thermal plasma environments. The interaction with walls leads to the erosion and the ablation of the latter and to the modification of the nature’s environment, but also in the case of electrodes (Cathode) to a modification of the electronic and ionic streams. In this research axis we focus not only on the description of zones near the electrodes but also on the theoretical and experimental quantification of flows on walls.

4. Processes and systems

Under this theme are gathered all the configurations that we study : extending from processes (projection torch, cutting torch, ..), to systems (cutting devices at low and high voltages), and even going through more academic study configurations (stabilized arc, transferred arc). Under this theme we explore the physical phenomena involved in the configurations and their influence on the applications or the expected effects. This theme is strengthened by experimental studies and by the developement of 3D models most of the time.