Trailing edge serrations effects on the aerodynamic performance of a NACA 643418

A study of the aerodynamic performance of a NACA 643418 airfoil with trailing edge serrations is presented. For the prediction of the changes in lift due to the serration installation, an empirical law is derived that can be extended to typical cambered airfoils for wind turbine applications. The la...

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Bibliographic Details
Published inWind energy (Chichester, England) Vol. 22; no. 3; pp. 392 - 406
Main Authors Llorente, Elena, Ragni, Daniele
Format Journal Article
LanguageEnglish
Published Bognor Regis John Wiley & Sons, Inc 01.03.2019
Subjects
aerodynamic performance
Aerodynamics
Cambering
Computational fluid dynamics
Computer simulation
drag
Lift
reynolds‐averaged navier‐stokes simulations
Trailing edges
trailing‐edge serrations
Turbines
Turbulence
Wind power
Wind turbines
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Summary:A study of the aerodynamic performance of a NACA 643418 airfoil with trailing edge serrations is presented. For the prediction of the changes in lift due to the serration installation, an empirical law is derived that can be extended to typical cambered airfoils for wind turbine applications. The law is deduced from 2D and 3D Reynolds‐averaged Navier–Stokes simulations (RANS) of the flow over the airfoil. Lift and drag together with the changes in the wake flow due to the presence of the serrated edges are investigated. An additional study of the sensitivity of the results at Rec = 3·106 with respect to the turbulence modeling is carried out by using three different RANS models: Spalart–Allmaras, k‐omega SST, and Transition SST. Results show that the changes in lift due to trailing‐edge extensions are approximated by the effect of a split plate with reduced length.
ISSN:1095-4244
1099-1824
DOI:10.1002/we.2293