Abstract
Radiative energy losses from an arc in jet air flow have been studied. By confirming the importance of these losses, the author supplements a previous paper (see abstr. A82063 of 1974) in which a large discrepancy in the arc energy balance was attributed to them. For arcs burning to an upstream cathode of sintered copper (tungsten in an M=0.8 air flow, radiation is the major energy loss mechanism, accounting for more than 50% of the column voltage requirements. The presence of upstream electrode vapours in the arc column is responsible for the high values of the radiation loss.

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