Estudo de tochas de plasma através da teoria da similaridade

TL;DRAbstract

In this thesis, generalized equations for the voltage-current characteristics have been obtained for a non transferred arc plasma torch and for a transferred arc plasma torch, using the method of the Theory of the Similarity.For the non transferred arc plasma torch, the experimental data was obtained for air as the plasmagenic gas and for currents of 10 to 295 A. For the transferred arc torch, the experiments were carried out for argon and currents of 300 to 1500 A. The non transferred plasma torch showed a descending voltage-current static characteristic, while the transferred plasma torch, the characteristic was dynamic, with strong anomalous behavior, consisting of the presence of hysteresis, besides possessing both the branches, the descendant and the ascendant.The tests of the transferred torch were carried out in an oven with refractory walls in argon atmosphere.Generalized equations had been obtained having one, two and three independent nondimensional parameters, being the choi

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