Wind Tunnel Experimental Study of Wind Turbine Airfoil Aerodynamic Characteristics

Abstract:

High lift and low drag are desirable for wind turbine blade airfoils. The performance of a high lift airfoil at high Reynolds number (Re) for large wind turbine blades is different from that at low Re number for small wind turbine blades. This paper investigates the performance of a high lift airfoil DU93-W-210 at high Re number in low Re number flows through wind tunnel testing. A series of low speed wind tunnel tests were conducted in a subsonic low turbulence closed return wind tunnel at the Re number from 2×10⁵ to 5×10⁵. The results show that the maximum lift, minimum drag and stall angle differ at different Re numbers. Prior to the onset of stall, the lift coefficient increases linearly and the slope of the lift coefficient curve is larger at a higher Re number, the drag coefficient goes up gradually as angle of attack increases for these low Re numbers, meanwhile the stall angle moves from 14° to 12° while the Re number changes from 2×10⁵ to 5×10⁵.

• Periodical: Applied Mechanics and Materials (Volumes 260-261)
• Pages: 125-129
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.260-261.125
• Online since: December 2012
• Authors: Xin Zi Tang, Xu Zhang, Rui Tao Peng, Xiong Wei Liu
• Keywords: Aerodynamic, Airfoil, Reynolds Number, Wind Tunnel, Wind Turbine Blade

References

[1] H. A. Ira, A.E. Doenhoff. Theory of Wing Sections. Dover Publications: New York, (1959).

[2] G.K. Yamauchi, J. Wayne. Trends of Reynolds number effects on two-dimensional airfoil characteristics for helicopter rotor analysis. NASA Technical Memorandum 84363, (1983).

[3] S. Wallmann, C. Klein. Investigation of high Reynolds number effects on rotor blades for wind turbines. European Wind Energy Conference & Exhibition, (2010).

[4] D.M. Somers. Design and experimental results for the S809 airfoil. NREL/SR-440-6918 UC Category: 1213 DE97000206, (1997).

[5] W.A. Timmer, R.P. Rooij. Summary of the delft university wind turbine dedicated airfoils. AIAA-2003-0352, (2003).

DOI: 10.2514/6.2003-352

[6] T.J. Mueller. An overview of micro air vehicle aerodynamics. Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications 2001: 1-13.

DOI: 10.2514/5.9781600866654.0001.0010

[7] R.K. Singh, M.R. Ahmed, M.A. Zullah, et al. Design of a low Reynolds number airfoil for small horizontal axis wind turbines. Renewable Energy 2012; 42: 66-76.

DOI: 10.1016/j.renene.2011.09.014

[8] Y. Zhou, M.M. Alam, H.X. Yang, et al. Fluid forces on a very low Reynolds number airfoil and their prediction. International Journal of Heat and Fluid Flow 2011; 32: 329-339.

DOI: 10.1016/j.ijheatfluidflow.2010.07.008

[9] S. D'Angelo, W.A. Timmer. Two wind turbines dedicated airfoils tested in two different wind tunnels: comparison and results. Windpower'95 conference, (1995).

[10] J.B. Barlow, W.H. Rae, P.J. Alan. Low-Speed Wind Tunnel Testing, third edition. John Wiley & Sons, Inc, (1999).

[11] M.S. Selig, R.W. Deters, G.A. Williamson. Wind tunnel testing airfoils at low Reynolds numbers. 49th AIAA Aerospace Science Meeting, AIAA-2011-875: 1-32.

DOI: 10.2514/6.2011-875