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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v10.i3.30
pages 379-392

2-D AND 3-D FLUIDYNAMIC AND PLASMA CHARACTERIZATION OF DC TRANSFERRED ARC PLASMA TORCHES FOR METAL CUTTING

Vittorio Colombo
Università degli Studi di Bologna, Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (D.I.E.M.) and C.I.R.A.M., Via Saragozza 8, 40123 Bologna, Italy
Emanuele Ghedini
Università degli Studi di Bologna, Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (D.I.E.M.) and C.I.R.A.M., Via Saragozza 8, 40123 Bologna
G. Masini
Università degli Studi di Bologna - Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.), Via Saragozza 8, 40123 Bologna - Italy
D. Russo
Università degli Studi di Bologna - Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.), Via Saragozza 8, 40123 Bologna - Italy
S. Dallavalle
Cebora S.p.A., Via Andrea Costa 24, 40057 Cadriano di Granarolo
M. Vancini
Cebora S.p.A., Via Andrea Costa 24, 40057 Cadriano di Granarolo

RÉSUMÉ

The aim of this work is to investigate by means of a 2-D and 3-D FLUENT® based numerical model the behaviour of a transferred arc plasma torch recently developed within Cebora S.p.A. for the cutting of a metallic substrate material. Flow and heat transfer equations are solved with coupled electromagnetic ones, for LTE optically thin plasma, while turbulence phenomena are taken into account by means of a k-ε Realizable model. Simulations include a prediction of the thermal behaviour of the hafnium insert of the cathode and trajectories of hafnium oxide particles emitted from it and the efficiency of nozzle cooling systems in various operating conditions including gas mixtures (O2/Air, H35/N2, Air/Air) fitted for various dimension and type of the cutting material. Results obtained from the simulations are compared with experimental measurements in order to perform a validation of the model in terms of pressure in different regions of the device, gas mass flow rate and nozzle temperature during the processing phase. For this purpose a modified plasma torch has been designed and used with realistic cutting conditions.


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