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Effect of reduced frequency and surface roughness on an airfoil in plunging motion

Soltani, M. R ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.2514/6.2007-77
  3. Publisher: 2007
  4. Abstract:
  5. An extensive experimental investigation to study the effect of the reduced frequency and surface grit roughness on an airfoil oscillating in plunging motion has been conducted. The application of surface grit roughness simulates surface irregularities that occur on the wind turbine blades. Data were taken at a Reynolds number of 0.42*10* and at a range of reduced frequencies, k=0.03-0.1. Tests were conducted at plunging amplitudes of ±10cm and ±15cm and at mean angles of attack of 0°, 10° and 18°. It was found that the width of the hysteresis loop, position of the figure-8 shape, slope of the lift coefficient curve and maximum lift force have been influenced by both oscillation frequency and surface roughness
  6. Keywords:
  7. Oscillation frequency ; Plunging motion ; Surface irregularities ; Angle of attack ; Hysteresis loops ; Reynolds number ; Surface roughness ; Turbomachine blades ; Wind turbines ; Airfoils
  8. Source: 45th AIAA Aerospace Sciences Meeting 2007, Reno, NV, 8 January 2007 through 11 January 2007 ; Volume 2 , 2007 , Pages 860-869 ; 1563478900 (ISBN); 9781563478901 (ISBN)
  9. URL: https://arc.aiaa.org/doi/abs/10.2514/6.2007-77