Abstract
An airfoil database was developed in the present work. The database includes a multivariate, unstructured grid, Radial Basis Function (RBF), optimization-compatible interpolator for airfoil aerodynamic coefficients. The database was designed to aid complex blade design optimizations carried out in a novel optimization framework, HAWTOpt2, being currently developed at DTU Wind Energy. In the database, the lift, drag and moment coefficients are stored as functions of airfoil family, thickness, Reynolds number and angle of attack. Aerodynamic add-ons and airfoil modifications are included in the database as separate airfoil families. Additionally, the database includes two different 3D correction methods and two different 360 degree extrapolation methods. Further, the database stores airfoil coordinates as functions of airfoil family and thickness. Those coordinates may also be interpolated using the RBF method. Present work included a demonstration of the coefficient interpolator in an optimization aimed at indicating the optimal layout of Vortex Generators on eroded blades of the DTU 10MW Reference Wind Turbine in order to maximize the Annual Energy Production.
Highlights
More and more complex and sophisticated design tools are necessary to fulfil the demand for larger, more effective and competitive wind turbines
An airfoil database was developed in the present work
The lift, drag and moment coefficients are stored as functions of airfoil family, thickness, Reynolds number and angle of attack
Summary
More and more complex and sophisticated design tools are necessary to fulfil the demand for larger, more effective and competitive wind turbines One of those tools is the novel optimization framework, HAWTOpt2 [1], being developed at DTU Wind Energy. The database is intended to store aerodynamic coefficients and shape coordinates of various airfoils, including those modified and with aerodynamic add-ons. The essential feature of the database is the optimizer-friendly, multivariate, unstructured grid, Radial Basis Function (RBF) interpolator for both airfoil aerodynamic coefficients and shape coordinates, i.e. Airfoil Blender. Aerodynamic coefficients are stored as functions of airfoil family, thickness, Reynolds number and angle of attack. The optimizer may request lift, drag and moment coefficients for a specific blend of airfoil families, thickness, Reynolds number and angle of attack regime. The airfoil database includes AirfoilPrep.py’s 3D correction by Selig [5] and the 3D correction by Bak [6] as well as AirfoilPrep.py’s 360 degree extrapolation by Viterna [7] and the one from DTU’s Power Pack [8]
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