On the influence of the nozzle length on the arc properties in a cutting torch
Date
2009
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Abstract
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.
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Keywords
influence of the nozzle geometry, physical properties of a cutting arc, oxygen cutting arc, influence of the nozzle length, cutting torch, arc properties
Citation
Journal of Physics
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