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HIGH SPEED JET CONTROL USING PLASMA ACTUATORS

Mo Samimy
Department of Mechanical Engineering The Ohio State University Columbus, OH 43210, USA

Jin-Hwa Kim
Department of Mechanical Engineering The Ohio State University Columbus, OH 43210, USA

I. Adamovich
Department of Mechanical Engineering, The Ohio State University Columbus, Ohio 43235-7531 USA

Y. Utkin
Department of Mechanical Engineering, The Ohio State University Columbus, Ohio 43235-7531 USA

S. Keshav
Department of Mechanical Engineering, The Ohio State University Columbus, Ohio 43235-7531 USA

Sinopsis

We have made significant progress in our on-going research in the development of localized arc filament plasma actuators and their application to control high-speed and high Reynolds number flows. We used a newly developed plasma generator to drive eight actuators distributed around the perimeter of a 2.54 mm diameter axisymmetric nozzle just upstream of the exit. The flow exiting the nozzle was an ideally expanded Mach 1.3 jet with a Reynolds number of over a million. The plasma generator could drive all eight actuators with any prescribed frequencies from 0 to 200 kHz, phase, and duty cycle. Only control frequencies over the range of 2 kHz to 20 kHz (StD of 0.13 to 1.3) were explored for this paper. While jet responded to control over the entire range of frequencies covered, robust and highly spatially coherent structures were generated over the range of StD of 0.33 to 0.6. Tremendous jet mixing enhancement was achieved with the use of first helical mode forcing over the range of StD of 0.2 to 0.4. The power consumption for all eight actuators was less than 1% of the flow power.