Abstract
It is shown that the equations used in the channel model representation of an arc in an axial gas flow define the upstream values of arc temperature and area where the plasma velocity is zero. Arc temperature and area are determined by the plasma material functions and the axial gradient of the plasma velocity at the stagnation point. The relations apply for either the stagnation point in a double flow nozzle or for the point immediately adjacent to the upstream electrode in a single flow system where there is also a stagnation point. It is predicted that arc temperatures and current densities will generally be larger for arcs in sulfur hexafluoride compared with nitrogen.
Published Version
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