FRVT - Artículos en Revistas Internacionales

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/396

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    Interpretation of Voltage Measurements in Cutting Torches.
    (2015) Prevosto, Leandro; Kelly, Héctor; Minotti, Fernando Oscar; Mancinelli, Beatriz
    Anode-cathode and nozzle-cathode voltages, plenum pressure and gas mass flow measurements in a low current (30 A) cutting torch, operated with oxygen gas, are used as inputs for an electrical model coupled to a simplified fluid model, in order to infer some properties of the plasma-gas structure that are difficult to measure.
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    On the influence of the nozzle length on the arc properties in a cutting torch
    (2009) Prevosto, Leandro; Kelly, Héctor; Risso, Marcelo Natalio; Infante, Damián Leandro
    In this work, an experimental study on the influence of the nozzle geometry on the physical properties of a cutting arc is reported. Ion current signals collected by an electrostatic probe sweeping across a 30 A oxygen cutting arc at 3.5 mm from the nozzle exit were registered for different nozzle lengths. The temperature and density radial profiles of the arc plasma were found in each case by an inversion procedure of these signals. A comparison between the obtained results shows that the shorter nozzle (RN = 0.50 mm, LN = 4.5 mm operated at 0.7 MPa and 35 Nl/min) produces a thinner and hotter arc than the larger nozzle (RN = 0.50 mm, LN = 9.0 mm operated at 1.1 MPa and 20 Nl/min). This behavior is attributed to the marked difference of gas flow rate due to the clogging effect. A smaller gas mass flow reduces the convective cooling at the arc border and decreases the power dissipation of the arc column, resulting in small axis temperatures.