Abstract
A systematic investigation of the radiative energy balance in cylindrical arcs is described. It is shown that consideration of the overlapping of lines within multiplets themselves, or even of different multiplets at higher pressures, is of particular importance. Methods of simplifying the frequency and spatial integration of the equation of radiative transfer are developed. These are tested by comparison with exact calculations. Considering the contributions of the continuum radiation, as well as of all important N I-, N II- and N III-lines, the radiative energy balance in nitrogen is computed for a wall-stabilized arc (1 atm, 5 mm dia., axial temperatures up to 26,000°K) and for a convection-stabilized arc (pressure between 12 and 24 atm, assumption of rectangular temperature profiles). Comparison with experimental results gives good agreement.
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