Communication Dans Un Congrès Année : 2024

Experimental Characterization of the Operation of Modular Cascade Plasma Torches

Résumé

Industries typically use the plasma spraying process because of its efficiency and flexibility. It involves a plasma jet made up of two columns: an arc column that originates at the cathode tip and a secondary column that ends at the anode's surface. The industry has historically preferred a two-electrodes plasma torch configuration with a single part anode. On the other hand, voltage instabilities have been noted to be problematic. Particles in the plasma are treated as a consequence of voltage variations caused by the arc attachment's continuous back and forth motion along the surface. New generations of plasma torches with segmented or cascaded configurations have been developed to overcome this problem. The Larmor torch is a modular cascaded plasma torch. Different tunnel structures (length and inner diameter) can be used. This study investigates four different configurations of this torch, called Larmor 9 and Larmor 15 (tunnel length), with tunnel diameters of 8 and 10mm, respectively, for two lengths. Several plasma spraying parameters, such as argon and hydrogen flow rates, the arc current intensity are examined for alumina material in order to determine the range of operating parameters. Diagnostic instruments are employed to examine plasma length, voltage fluctuations, particle characteristics (temperature and velocity) and spraying efficiency in order to comprehend how various torch combinations operate.

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Dates et versions

hal-04942845 , version 1 (12-02-2025)

Identifiants

  • HAL Id : hal-04942845 , version 1

Citer

Myriam Sleiman, Geoffrey Darut, Marie-Pierre Planche, Ralph Seulin, Jean Jacques Gonzalez, et al.. Experimental Characterization of the Operation of Modular Cascade Plasma Torches. 11 RIPT 2024, Jun 2024, Julich, Germany. ⟨hal-04942845⟩
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