Control of flow from the exhaust of an aircraft engine
Creators:Murphy, Colleen E.
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Mechanical Engineering Honors Theses;2005
Enhanced mixing of the flow from a jet engine is of great interest for military purposes. Successful studies have been performed proving that improved mixing is possible in low speed and low Reynolds number flows. However, a lack of high bandwidth and high amplitude actuators has hindered the progress to control high speed and high Reynolds number flows. The recent development of localized arc filament plasma actuators has made it possible to control such flows. These actuators create electric discharges to manipulate the flow instabilities in the jet exhaust. For this research project, plasma actuators were used to control structures in a jet with a flow exiting the nozzle at Mach 1.3 and Reynolds number of a million. My research focused on the effects of frequency, duty cycle, and mode of the plasma actuators on control of the jets. The plasma actuators were able to manipulate the flow and enhance mixing in all of the forcing modes. However, the helical mode produced the greatest effect in the flow.
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