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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25715

Title: Active Flow Control Using Synthetic Jet Actuation
Authors: Goodfellow, Sebastian
Advisor: Sullivan, Pierre E.
Department: Mechanical and Industrial Engineering
Issue Date: 5-Jan-2011
Abstract: The influence of periodic excitation from synthetic jet actuators, SJA, on boundary layer separation and reattachment over a NACA 0025 airfoil at a low Reynolds number is studied. All experiments reported are performed in a low-turbulence recirculating wind tunnel at a Reynolds number of 100000 and angle of attack of α=5◦. Mounted below the surface of the airfoil, the SJA consists of four 32.8 mm diameter piezoelectric ceramic diaphragms positioned in a single row. Flow visualization results show a reattachment of the boundary layer and a significant reduction in wake structure. Velocity profiles downstream of the trailing edge and the results show a drastic reduction in wake size as excitation is introduced. A spectral analysis was conducted in the wake region and showed the presence of vortex shedding at a frequency of 22 Hz. When excitation was applied at 935 Hz and 250 Vp−p, the shedding frequency shifted to 50Hz.
URI: http://hdl.handle.net/1807/25715
Appears in Collections:Master
Department of Mechanical & Industrial Engineering - Master theses

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