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Abstract
The main aIm of the present study IS to investigate characteristics of the corona discharges in different gases. Subsequently, the corona discharges have been generated in coaxial wire-cylinder, wire-duct and wire-plate reactors, which are being used over a wide range in various practical and technological applications. The reactors were fed by either air, oxygen (electronegative gases), nitrogen, argon or helium (electropositive gases) flowing with a constant rate at atmospheric pressure and room temperature and stressed by either DC or AC voltage.
An experimental parametric study was made to investigate how the corona current-voltage characteristics are influenced by type of the flowing gas through the reactor, the geometrical configuration of the reactor and the voltage mode applied to it. Also, oscillograms showing the wave form of the AC voltage applied to the reactors and the corresponding discharge current have been recorded with the different gases. Furthermore, features of the corona discharge plasma formed around the wires in the different gases have been recorded photographically.
The same characteristics of the corona discharges have been investigated under an external magnetic field applied to the wire-plate reactor up to 0.65 T. However, the results have shown that there is no significant effect for the magnetic field in the used range on the characteristics of corona discharges.
The characteristics of the corona discharges in the different gases have been compared with each other under the same conditions. This is aimed to provide more information on the physical mechanisms of the corona discharges in the investigated gases. The obtained results have been discussed in light of gas discharge physics and its applications.