WIDE-LENGTH DC ARC,
Abstract
The characteristics of very long DC arcs were measured between various electrodes in the air, nitrogen, oxygen, carbon dioxide, water vapor and hydrogen. The measurements indicated that the characteristics of the gas are the determining factors for the pattern of the characteristic, whereas the electrode material does not have any essential influence. The Ayrton formula represents the pattern well in all cases in which a sharply defined band is seen in the middle of the arc. The numerical results are shown in the following cases: Probe measurements in the air arc gave the result that the potential drop/cm along the arc is the same in all parts of the positive column, i.e., independent of the length. With increasing amperage along a hyperbola, it decreases. Cathode and anode drop were measured directly. In the carbon dioxide arcs, the current intensity is determined by cross section measurements and it was shown that it increases linearly with increase in field strength. Finally, a theory was proposed on the time of conduction processes that take place in arcs, the idea of which is based on the collision ionization by means of such electrons, the disorderly temperature velocity of which is above that required for ionization.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 13, 1967
- Accession Number
- AD0825154
Entities
People
- W. Grotrian
Organizations
- National Air and Space Intelligence Center