DIAGNOSTICS OF A PLASMA FLAME EXHAUSTING TO ATMOSPHERIC PRESSURE
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
Pagination or Media Count:
A spectrometric method to measure temperature in a high temperature gas stream produced by a Gerdien-type arc plasma generator was developed. The Fowler-Mil e peaking function method was employed which utilized both the spectral line and continuum radiation in the 4000 A range from an argon plasma. Excitation temperatures measured from line radiation and electron temperatures determined from the continuum radiation agreed within about five percent. The method was applicable provided temperatures larger than 16,000 K existed at the center of the axisymmetric jet the range of temperature measurement was then from about 7000 to 28,000 K. Comparison of the average temperature obtained using the spectrometric method with the average temperature obtained using an energy balance indicated serious disagreement. Comparison of the total enthalpy obtained using the spectral temperature with that obtained from the energy balance also indicated disagreement. The reason for the disagreement was that the jet consisted of high frequency arc channels moving about in the stream and that the radiant emission resulted from these high temperature electrons rather than from the average gas atoms.
- Inorganic Chemistry
- Combustion and Ignition