Aerodynamic performance enhancement of the DU99W405 airfoil for horizontal axis wind turbines using slotted airfoil configuration

Het Bhavsar, Sukanta Roy and Hakeem Niyas

Energy, 2023, vol. 263, issue PA

Abstract: Unsteady aerodynamics is a significant problem in designing thicker airfoils for HAWT applications. The inboard airfoils of the wind turbine blades are kept thicker to maintain structural integrity, but it comes with some cons, such as loss of aerodynamic efficiency. The current study is focused on solving this problem for thick airfoils by introducing a lift control device – slot. A novel slot design is introduced to the DU-99-W-405 airfoil geometry to study the effect of the slot on lift and drag coefficients (Cl and Cd) of the airfoil over a wide range of angles of attack. The boundary layer separation point on the upper surface is observed by performing a numerical simulation of the clean airfoil. Five different positions of the slot along the chord (slots 1, 2, 3, 4, and 5) are considered for numerical simulation. Slots 1 and 5 are near the leading and trailing edges of the airfoil. The other slots are kept between them. Cl and Cd values are calculated for all the slotted configurations, and the results were plotted with respect to the angle of attack. The optimum Cl, Cd, and Cl/Cd values are obtained for the slot 2 configuration, with corresponding improvement of 68.8%, 36.9%, and 116%.

Keywords: Horizontal axis wind turbines; Slotted airfoil; Stall; Lift coefficient; Lift to drag ratio; Numerical modeling (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:263:y:2023:i:pa:s036054422202552x

DOI: 10.1016/j.energy.2022.125666

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