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Effect of leading-edge roughness on boundary layer transition of an oscillating airfoil

Marzabadi, F. R ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.scient.2012.12.035
  3. Publisher: 2013
  4. Abstract:
  5. A series of experiments were conducted to study the effect of leading-edge roughness on the state of the boundary layer of a wind turbine blade section using multiple hot-film sensors. The experiments involved static and dynamic tests, where airfoil motion was of plunging type oscillation. The application of surface grit roughness simulates surface irregularities that occur on the wind turbine blades. The measurements showed that increasing the angle of attack results in movement of transition locations toward the leading edge. Surface roughness moved the transition point toward the leading edge and caused early trailing edge turbulent separation, which resulted in reducing the effectiveness of the airfoil. Boundary layer instability frequencies were dominated through the transition
  6. Keywords:
  7. Boundary layer transition ; Boundary layer instability ; Boundary layer transitions ; Plunging ; Reduced frequency ; Static and dynamic tests ; Surface irregularities ; Transition locations ; Turbulent separation ; Boundary layers ; Experiments ; Surface roughness ; Turbomachine blades ; Wind turbines ; Airfoils ; Airflow ; Boundary layer ; Oscillating flow ; Roughness ; Sensor ; Transition zone ; Wind turbine
  8. Source: Scientia Iranica ; Volume 20, Issue 3 , 2013 , Pages 508-515 ; 10263098 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1026309813000680