Time-resolved and time-averaged net force (electrohydrodynamic force plus viscous drag) are presented for a dielectric-barrier-discharge-based aerodynamic plasma actuator operated in artificial atmospheres composed of nitrogen (N2) with various concentrations of electronegative gasses: 1–20% oxygen (O2) and 0.01–0.34% sulfur hexafluoride (SF6). It is possible to deconvolve and isolate the role of oxygen to the negative-going or forward stroke of the discharge and to the region of parameter space with high E/n: a change in oxygen content by a factor of 20 yields only a 20% increase in force produced when 12 kV AC is applied to the system but yields a 170% increase when the voltage amplitude is increased by less than a factor of 2, to 20 kV applied. It is shown that substituting SF6 for O2 produces a mild net increase in force production that saturates at very low SF6 concentrations (0.1%) and that the increase is limited because of substantial (50%) losses of the momentum to drag even though the momentum input is increased by a factor of 2.


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    Title :

    Normalized Electronegative Species Effects in the Dielectric-Barrier-Discharge Plasma Actuator



    Published in:

    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 55.60 Raumfahrttechnik / 55.60 / 50.93 / 55.50 / 50.93 Weltraumforschung
    Local classification TIB:    770/7040




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