Effect of surface contamination on the performance of a section of a wind turbine blade

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

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  1. Type of Document: Article
  2. Publisher: 2007
  3. Abstract:
  4. A series of low speed wind tunnel tests on a section of a 660 Kw wind turbine blade which is under constructer were conducted to examine the effects of distributed surface contamination on its performance characteristics. At first model was tested in the clean condition and after that it was tested with tree different types of roughness. The data shows that this particular airfoil is very sensitive to the applied surface roughness. For the contaminated model the roughness, 0.5mm height was distributed over the entire upper surface of the airfoil such that the distribution pattern was denser in the vicinity of the leading edge and thinner in the trailing edge area. Statistical data show that the leading edge contamination is about 4.5 times denser than the trailing edge one. By spreading the roughness on the airfoil upper surface the maximum lift coefficient decreased drastically, up to %42, however, the stall angle of attack increased slightly. In contrast to the clean model, the maximum lift coefficient of the roughed airfoil increased as the Reynolds number was increased. The effect of other types of roughness, zigzag roughness and strip tape were less than that of the contaminated one. It seems that these models just change the laminar flow to turbulent one hence they are not a good model for studding the effect of surface contamination
  5. Keywords:
  6. Airfoils ; Lift ; Reynolds number ; Statistical methods ; Surface roughness ; Wind turbines ; Surface contamination ; Wind turbine blades ; Zigzag roughness ; Turbomachine blades
  7. Source: 45th AIAA Aerospace Sciences Meeting 2007, Reno, NV, 8 January 2007 through 11 January 2007 ; Volume 19 , 2007 , Pages 13026-13036 ; 1563478900 (ISBN); 9781563478901 (ISBN)
  8. URL: https://arc.aiaa.org/doi/10.2514/6.2007-1081