AN ANODE COMPARISON STUDY IN A WALL-STABILIZED ARGON ARC.
Interim technical rept.,
MINNESOTA UNIV MINNEAPOLIS HEAT TRANSFER LAB
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Experiments were conducted to determine whether or not transpiration cooling the anode of a cascaded, wall-stabilized, argon arc could substantially reduce the net power loss to the anode. A water-cooled copper anode and a geometrically similar porous graphite transpiration-cooled anode were used to make a direct comparison of the power losses. In addition, complete heat balances of the arc using both anode types were made. These measurements gave the losses to the other apparatus components. From these measurements and a proposed model for the energy transfer to the anode, anode fall values were calculated for the case of the water-cooled anode. In addition, the contribution of the various modes of energy transfer to the anode were determined. Heat flux measurements to the segmented constrictor tube were used to determine the local radiation and conduction to the wall. Also, measurements were made of the arc voltage - current characteristics and the voltage distribution along the plasma column from which the field strength can be determined. Author
- Plasma Physics and Magnetohydrodynamics