On factors influencing arc filament plasma actuator performance in control of high speed jets |
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Authors: | Casey Hahn Martin Kearney-Fischer Mo Samimy |
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Institution: | (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; |
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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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