HEAT TRANSFER EFFECTS ARISING FROM ARC ROTATION IN PLASMA ARC HEATERS OF THE SELF-INDUCED MAGNETIC FIELD TYPE
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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The paper is concerned with an analysis of the thermal behavior of high input power about 15 megawatt arc heaters operating at values of total bulk enthalpy up to 2500 Btulb. The electrode system is essentially a rail accelerator adapted for continuous operation by making it re-entrant the self- induced magnetic field brings about rapid movement of the arc roots to prevent destruction of the electrodes. The rate of rotation of the arc column which is subject to aerodynamic drag is shown to be a function of apparent electrode gap and current and the stagnation temperature and pressure in the arc chamber. A distinction can also be drawn between long and short arcs, depending on whether the interelectrode gap is large or small. The value of the arc rotation rate which ranges between about 50 and 1000sec had a considerable bearing on the thermal efficiency of short-gap arcs because of the dependence of the convective losses on it.
- Test Facilities, Equipment and Methods
- Electricity and Magnetism
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics