| Autor: |
John Strike, William R. Lindberg, Paul F. Medina, Manjinder S. Saini, Jonathan W. Naughton |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. |
| DOI: |
10.2514/6.2010-91 |
| Popis: |
Flow fleld behind an oscillating fence has been studied using phase-locked Particle Image Velocimetry. Measurements were conducted in the Strouhal number range Sta = 0.008 0.2 along the mid-span of the fence to develop an understanding of the efiect of increasing Strouhal number on the vortical disturbances. For Sta = 0.006 and 0.016, ∞ow-fleld was also captured at two ofi-center locations to study the three-dimensionality of these vortical structures. The results indicate that the formation, evolution and convection of these disturbances is strongly efiected by Strouhal number. The large time scales associated with lower Strouhal numbers provide more time for the structure to develop. Furthermore, these large time scales at lower Strouhal number also cause a secondary vortex to form even as the fence is descending. The span-wise measurements indicate that the structure remains two-dimensional for a longer time at a higher frequency and becomes strongly three dimensional when the fence starts to descend. Such measurements at a number of fence frequencies (or Strouhal number) are required to better understand the efiect of frequency on three-dimensionality of the fence produced structures, which is important in assessing the capability of the fence to produce large pressure changes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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