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Effect of surface roughness on an airfoil in pitching motion

Seddighi, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: doi.org/10.2514/6.2006-3918
  3. Publisher: 2006
  4. Abstract:
  5. Extensive experimental tests have been conducted to examine the roughness effects on the aerodynamic performance of a model in an oscillatory motion. All tests were carried out in a 0.8×0.8 m 2 low-speed wind tunnel. The model had 0.25m chord and was pitched about its quarter-chord. Data were acquired at various Reynolds number and reduced frequencies. Surface roughness was applied at two different locations of the model upper surface, leading edge and the point of maximum thickness. Furthermore, tunnel turbulent was varied and all tests were repeated. The results indicate that the width of the hysteresis loop, position of the figure eight shape, slope of the normal force coefficient curve, as well as the maximum normal force of the model were all influenced by both the surface roughness and turbulent intensity significantly
  6. Keywords:
  7. Low speed wind tunnels ; Oscillatory motions ; Pitching motions ; Reduced frequencies ; Aerodynamics ; Airfoils ; Oscillators (mechanical) ; Reynolds number ; Turbulent flow ; Velocity measurement ; Wind tunnels ; Surface roughness
  8. Source: 36th AIAA Fluid Dynamics Confernce, San Francisco, CA, 5 June 2006 through 8 June 2006 ; Volume 4 , 2006 , Pages 2785-2792 ; 1563478102 (ISBN); 9781563478109 (ISBN)
  9. URL: https://arc.aiaa.org/doi/abs/10.2514/6.2006-3918