RADIATION FROM AN ALTERNATING CURRENT NITROGEN ARC,
Abstract
An experimental investigation of the total power radiated per unit length from a nitrogen arc operating on alternating and direct current is outlined and sample results are given. The measured results include average and instantaneous radiant power, average electrical power, root mean square and instantaneous current and voltage, arc radii, spectra, and average absorption as well as the flow parameter such as total mass flow rate and vortex strength. In addition, radiometer calibration techniques and the sources of error are discussed. In order to compare measured quantities with analytical calculations, an approximate solution of the single fluid time-dependent energy equation and Kirchhoff's voltage law was obtained. The solution is based on a simplified model of the arc column, and approximate equations are obtained for arc voltage, current, radius, temperature, and radiation in terms of the root mean square voltage gradient which remains as an unknown. The important parameters include line frequency and voltage, inductance, thermal diffusivity, and approximate slopes of electrical conductivity and radiant power per unit volume as a function of the heat conductivity potential. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1965
- Accession Number
- AD0620043
Entities
People
- Paul W. Schreiber
Organizations
- Air Force Research Laboratory