Hydrodynamic Model for the Plasma-Gas Flow in a Cutting Torch Nozzle.
Date
2004
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Abstract
We present a simple hydrodynamic model to obtain the profiles of the relevant physical quantities along a nozzle
of arbitrary cross-section in a cutting torch. The model uses a two-zone approximation (a hot central plasma
carrying the discharge current wrapped by a relatively cold gas which thermally isolates the nozzle wall from
the plasma). Seeking for a solution with sonic conditions at the nozzle exit, the model allows expressing all the
profiles in terms of the externally controlled parameters of the torch (geometry of the torch, discharge current,
mass flow of the gas and plenum pressure) and the values of the arc and gas temperatures at the nozzle entrance.
These last two values can be estimated simply appealing to energy conservation in the cathode-nozzle region.
The model contains additional features compared with previous reported models, while retaining simplicity.
The detailed consideration of an arc region coupled to the surrounding gas dynamics allows determining voltage
drops and consequent delivered power with less assumptions than those found in other published works, and at
the same time reduces the set of parameters needed to determine the solution.
Description
Keywords
Hydrodynamic Model., Cutting Torch., Plasma-Gas Flow.
Citation
Brazilian Journal of Physics.
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