RESEARCH STUDY OF RADIATION HEAT FLUX FROM HIGH PRESSURE AIR ARCS
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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A method was developed for computation of radiant interchange within an electric arc where self absorption is important. Most or all radiation in the vacuum u.v. range is reabsorbed before it gets out of the arc. Present values of absorption coefficients are within an order of magnitude of predicting radiation losses as determined by direct experimental measurement. An arc was operated in air at 100 atmospheres sufficiently quiescent to measure a temperature profile at 100 amperes but great care must be taken to start symmetrically and avoid disturbances. At 400 amperes even extreme precautions are not sufficient to forestall instabilities. The air arc constrictor is uncooled and is designed for quasi-steady operation for 1 to 5 milliseconds depending on current level.
- Test Facilities, Equipment and Methods