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Appl. Sci. 2018, 8(7), 1111; https://doi.org/10.3390/app8071111

Aerodynamic Performance of Wind Turbine Airfoil DU 91-W2-250 under Dynamic Stall

1,2
,
1,3,4,* , 1,3,4
,
1,2
and
1,2
1
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Key Laboratory of Wind Energy Utilization, Chinese Academy of Sciences, Beijing 100190, China
4
National Research and Development Center of Wind Turbine Blade, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 29 June 2018 / Accepted: 29 June 2018 / Published: 10 July 2018
(This article belongs to the Special Issue Wind Turbine Aerodynamics)
View Full-Text   |   Download PDF [12938 KB, uploaded 10 July 2018]   |  

Abstract

Airfoils are subjected to the ‘dynamic stall’ phenomenon in significant pitch oscillations during the actual operation process of wind turbines. Dynamic stall will result in aerodynamic fatigue loads and further cause a discrepancy in the aerodynamic performance between design and operation. In this paper, a typical wind turbine airfoil, DU 91-W2-250, is examined numerically using the transition shear stress transport (SST) model under a Reynolds number of 3×105. The influence of a reduced frequency on the unsteady dynamic performance of the airfoil model is examined by analyzing aerodynamic coefficients, pressure contours and separation point positions. It is concluded that an increasingly-reduced frequency leads to lower aerodynamic efficiency during the upstroke process of pitching motions. The results show the movement of the separation point and the variation of flow structures in a hysteresis loop. Additionally, the spectrum of pressure signals on the suction surface is analyzed, exploring the level of dependence of pressure fluctuation on the shedding vortex and oscillation process. It provides a theoretical basis for the understanding of the dynamic stall of the wind turbine airfoil. View Full-Text
Keywords: wind turbine airfoil; dynamic stall; boundary layer separation; aerodynamic characteristics wind turbine airfoil; dynamic stall; boundary layer separation; aerodynamic characteristics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, S.; Zhang, L.; Yang, K.; Xu, J.; Li, X. Aerodynamic Performance of Wind Turbine Airfoil DU 91-W2-250 under Dynamic Stall. Appl. Sci. 2018, 8, 1111.

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