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Roughness and turbulence effects on the aerodynamic efficiency of a wind turbine blade section

Soltani, M. R ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology , 2016
  3. Abstract:
  4. Numerous experiments were conducted on the section of a 660 kw wind turbine blade in a subsonic wind tunnel. The selected airfoil was tested with a clean and distributed contamination roughness surface, with a high and low tunnel turbulence intensity. Surface contamination was simulated by applying 0.5 mm height roughness over the entire upper surface of the airfoil. The surface pressure distribution is measured under a steady and unsteady condition, at three Reynolds numbers; 0.43, 0.85, and 1.3 million, and over a range of angles of attack, AOA=7°-19°. Unsteady data were acquired by both pitch and plunge-type oscillation of the model about its quarter chord at a reduced frequency of 0.07. Results show that the surface roughness reduces section aerodynamic efficiency and the lift coefficient, but increases the drag coefficient for all Reynolds numbers. The application of roughness reduces the upper surface pressure coefficient and extends a separation region at high angles of attack. Increasing the tunnel turbulence intensity resulted in delay of the stall, an increase of maximum lift coefficient, and smoothness of stall behavior. However, the drag coefficient increased significantly. Furthermore, turbulence intensity affected the predicted power output of the blade
  5. Keywords:
  6. Airfoil characteristics ; Wind tunnel ; Wind turbine ; Aerodynamic drag ; Aerodynamics ; Airfoils ; Angle of attack ; Drag ; Drag coefficient ; Efficiency ; Lift ; Reynolds number ; Surface roughness ; Turbomachine blades ; Turbulence ; Wind tunnels ; Wind turbines ; Aerodynamic efficiency ; Maximum lift coefficient ; Pitching ; Plunging ; Range of angles of attack ; Roughness sensitivity ; Surface contaminations ; Surface pressure distribution ; Turbine components
  7. Source: Scientia Iranica ; Volume 23, Issue 3 , 2016 , Pages 927-941 ; 10263098 (ISSN)
  8. URL: http://www.scientiairanica.com/en/ManuscriptDetail?mid=2566