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On factors influencing arc filament plasma actuator performance in control of high speed jets

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Abstract

Localized arc filament plasma actuators (LAFPAs) have been developed and used at The Gas Dynamics and Turbulence Laboratory for the purpose of controlling high-speed and high Reynolds number jets. The ability of LAFPAs for use in both subsonic and supersonic jets has been explored, and experiments to date have shown that these actuators have significant potential for mixing enhancement and noise control applications. While it has been established that the actuators manipulate instabilities of the jet, the exact nature of how the actuation couples to the flow is still unclear. All of the results previously reported have been based on a nozzle extension that has an azimuthal groove of 1 mm width and 0.5 mm depth along the inner surface approximately 1 mm upstream of nozzle extension exit. The ring groove was initially added to shield the plasma arcs from the high-momentum flow. However, the effect of the ring groove on the actuation mechanism is not known. To explore this effect, a new nozzle extension is designed, which relocates the actuators to the nozzle extension face and eliminates the ring groove. Schlieren images, particle image velocimetry and acoustic results of a Mach 0.9 jet of Reynolds number ~6.1 × 105 show similar trends and magnitudes with and without a ring groove. Thus, it is concluded that the ring groove does not play a primary role in the LAFPAs’ control mechanism. Furthermore, the effect of the duty cycle of the actuator input pulse on the LAFPAs’ control authority is investigated. The results show that the minimum duty cycle that provides complete plasma formation has the largest control over the jet.

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Acknowledgments

The support of this research by NASA Glenn Research Center with James Bridges and Cliff Brown is greatly appreciated. The authors thank Jin-Hwa Kim for his support.

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Authors and Affiliations

  1. Gas Dynamics and Turbulence Laboratory, Aeronautical and Astronautical Research Laboratories, Department of Mechanical and Aerospace Engineering, The Ohio State University, 2300 West Case Road, Columbus, OH, 43235-7531, USA

    Casey Hahn, Martin Kearney-Fischer & Mo Samimy

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  1. Casey Hahn
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  2. Martin Kearney-Fischer
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  3. Mo Samimy
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Correspondence to Mo Samimy.

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Hahn, C., Kearney-Fischer, M. & Samimy, M. On factors influencing arc filament plasma actuator performance in control of high speed jets. Exp Fluids 51, 1591–1603 (2011). https://doi.org/10.1007/s00348-011-1172-5

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  • DOI: https://doi.org/10.1007/s00348-011-1172-5

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