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.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OTU.1807/25715 |
| Date | 05 January 2011 |
| Creators | Goodfellow, Sebastian |
| Contributors | Sullivan, Pierre E. |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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