Vibrational temperatures T v of N 2 ( C 3 Π u ) , reduced electric fields E / N , and relative number densities of N 2 ( C 3 Π u ) and N 2 + ( B 2 Σ u + ) have been measured for the positive and negative voltage half-cycles of a surface dielectric barrier discharge (SDBD) using optical emission spectroscopy. The measurements were performed for a sinusoidally driven SDBD having amplitudes of 4450 and 5900 V and a frequency of 5000 Hz. The relative number density profiles of N 2 ( C 3 Π u ) and N 2 + ( B 2 Σ u + ) , as a function of voltage, show the difference in discharge structure of the two voltage half-cycles, as well as a transition in discharge structure during the negative voltage half-cycle. The transition in discharge structure was also evident in the E / N results. The transition in discharge structure occurred by increasing the applied voltage, resulting in the presence of weak and strong tufts at 4450 and 5900 V, respectively. In particular, the presence of strong tufts resulted in a localized enhancement in the production of N 2 + ( B 2 Σ u + ) by a factor of 6 and in N 2 ( C 3 Π u ) by a factor of 1.8, as well as an increase in the E / N by a factor of 1.6, within the electrode gap.


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    Title :

    Spectroscopic Investigation of a Dielectric Barrier Discharge


    Contributors:

    Published in:

    AIAA Journal ; 52 , 5 ; 991-997


    Publication date :

    2014-05-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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