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Caractérisation d'un jet de plasma d'argon laminaire : détermination des champs de températures par spectroscopies atomique et moléculaire et mesures de vitesses d'écoulement

Abstract : Plasma jets are widely employed both in industry and in laboratories for various applications such as wastetreatment, cutting or spraying protection coating. Usually, the plasma jets are employed in turbulent flowregime. This flow regime is characterised by large plasma jet fluctuations, undesirable in material processing, because they will reduce the process repeatability and controllability. A more stable plasma jet can be generated by reducing the flow rate of the plasma forming gas, and this is called a laminar plasma jet. Few studies have been published on the laminar plasma jet, which has limited the development of these torches. The aim of this thesis is to study a laminar argon plasma jet at atmospheric pressure. The plasma jet diagnostic was performed with an optical emission spectroscopy experiment. The atom and molecule spectra from the jet have been recorded. These results have shown that ambient air is entrained into the plasma jet. In addition, the plasma jet velocity fields were measured by a Pitot tube. The temperature and velocity distributions determined in the experiments were compared to the numeric model results. Finally, we have developed a method to measure the plasma jet temperature from the emission spectra of molecules of MgO and CN which are produced from the magnesium combustion injected into the plasma and the air combustion respectively. These molecules are of great interest in industrial processes but also in the field of aerospace.
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Emilie Langlois-Bertrand. Caractérisation d'un jet de plasma d'argon laminaire : détermination des champs de températures par spectroscopies atomique et moléculaire et mesures de vitesses d'écoulement. Autre. Université d'Orléans, 2011. Français. ⟨NNT : 2011ORLE2024⟩. ⟨tel-00661299⟩

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