Accession Number : AD0658459

Title :   ELECTRIC ARC DISCHARGES IN TRANSVERSE MAGNETIC FIELDS. PART I,

Corporate Author : AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Schrade,Herbert O.

Report Date : JUN 1967

Pagination or Media Count : 121

Abstract : The dynamic behavior of electric arc discharge columns, which are subjected to transverse external magnetic fields, was studied through an analysis of all the forces acting normal to a segment of the arc column. This analysis led to an explanation of 'magnetic arc pumping' which was found to be the cause of arc retrograde motion as well as the discontinuous motion of electrode attachment points. It is shown that a gasdynamic force is generated through the combined action of the self-induced magnetic field of a current-carrying plasma and of a superimposed external magnetic field. This force opposes the Lorentz force generated by the external field; it is the reaction force of a hydromagnetically induced transverse gas flow which is generated within the current-carrying channel. Arc pumping and associated phenomena may also occur in the absence of an external magnetic field if the arc column is curved. This is explained by the fact that the distribution of Lorentz forces on a curved arc column is comparable to that on a straight arc column in a transverse magnetic field. (Author)

Descriptors :   (*ELECTRIC DISCHARGES, *MAGNETIC FIELDS), PLASMAS(PHYSICS), ELECTRIC ARCS, ARC HEATERS, MAGNETOHYDRODYNAMICS, VORTICES, DRAG, TEST FACILITIES, MOTION

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE