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|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.|
|Appears in Collections:||Master|
Department of Mechanical & Industrial Engineering - Master theses
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