Effect of Frequency on the Performance of a Section of a Wind Turbine Blade

  • Ali Malekzadeh

Abstract

A series of low speed wind tunnel tests on a section of a 660 Kw wind turbine blade were conducted to examine the effects of frequency on its performance characteristics. The airfoil profile was NACA 63-617 and selected from the mid section of the turbines’ blade radius which generates the main part of the blade torque. Dynamic tests were performed for three cases of prestall, stall and post stall conditions. The domain of oscillations was 5 degrees and at 3 mean angles of attack which is 5, 10 and 18 degrees. The model was tested for four Reynolds number and for various reduced frequencies. In downstroke motion, it was obvious that oscillation had positive effect on aerodynamic characteristics at low angles of attack but negative effect happened post stall angles of attack that reduced lift coefficient. This phenomenon was in conflict with upstroke motion.

References

REFRENCES
[1] Prandtl., "Uber die Entstehung von Wirbeln in der idealen Flussigkeit, mit Anwendung auf die Tragflugeltheorie und andere Aufgaben," Hydro- und Aerodynamik, Berlin, Julius Springer Verlag, pp. 18-33, 1924.
[2] Binbaum, W., "Das ebene Problem des schlagenden Flugels," Zeitschrift fur angewandtle Mathematik (ZAMM), Vol. 4, pp. 277-292, 1924.
[3] Wagner, H., "Uber die Entstehung des dynamischen Aufriebs an Tragflugeln," Zeitschrift fur angewandtle Mathematik und Mechanik (ZAMM), Vol. 5, pp. 17-35, 1925.
[4] Theodorsen, T., "General Theory of Aerodynamic Instability and the Mechanism of Flutter," NACA Rep. 498, 1935.
[5] Van De Vooren and Van De Vel, “Unsteady Profile Theory in Incompressible Flow,” Archiwum Mechaniki Stosowaneji, Vol. 3, No. 16, 1964, pp. 709-739.
[6] McCroskey, W. J., and Philippe, J.J., “Unsteady Viscous Flow on Oscillating Airfoils,” AIAA Journal, Vol. 13, No. 1, January 1975.
[7] Giesing, J.P, “Unsteady Two-Dimensional Potential Flow with Lift”, Douglas Aircraft Report, No. CB-32144, March1965.
[8] McAlister, K.W., Carr, L.W., and McCroskey, W.J., “Dynamic Stall Experiments on the NACA 0012 Airfoil,” NASA TP-1100, January 1978.
[9] Ericsson. L.E., and Reding, J.P., “Unsteady Flow Concepts for Dynamic Stall Analysis,” AIAA Journal of Aircraft, Vol. 21, Aug 1984, pp. 601-606.
[10] Walker, J.M., Helin, H.E., and Strickland, J.H., “An Experimental Investigation of an Airfoil Undergoing Large-Amplitude Pitching Motions,” AIAA Journal, Vol. 23, No. 8, 1985.
[11] Askari, F., “Experimental Study of a Wind Turbine Blade Section”, M.S. Thesis, Aerospace Dept., Sharif University of Technology, Tehran, IRAN, 2004.
Published
2013-05-16
How to Cite
Malekzadeh, A. (2013). Effect of Frequency on the Performance of a Section of a Wind Turbine Blade. Majlesi Journal of Energy Management, 2(2). Retrieved from http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/46
Section
Articles