Noise mitigation of a jet using localized arc filament plasma actuators: Effect of shielding ring groove on control authority of actuators
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Date
2010-06
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The Ohio State University
Abstract
Localized arc filament plasma actuators (LAFPAs) are used at The Gas Dynamics and Turbulence Laboratory (GDTL) for the purpose of controlling the downstream development of a 1-inch exit diameter jet. The lab has the capability to study both subsonic and supersonic jets with a primary goal being the mitigation of noise emitted by a jet. However, the mechanism by which the actuators are capable of perturbing the instabilities of the jet is unclear. It has been proposed that the ring groove, initially added to shield the plasma arcs from the high-speed jet flow, of the nozzle extension that houses the actuators is crucial for effective actuation. To study this possibility a new nozzle extension, which relocates the electrodes to the nozzle extension face and deletes the ring groove, is used. A comparison of the acoustic results of a traditional extension with a ring groove and the new nozzle extension without the ring groove is used to determine the effect of the ring groove. The results show that the same general trends and levels of noise attenuation and amplification are achieved with either extension. Thus, it is concluded that the ring groove is not essential for effective actuation. Advisor: Mo Samimy
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Keywords
flow control, aeroacoustics, LAFPA, fluid dynamics, acoustics