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ECN publicatie:
Usage of Numerical Optimization in Wind Turbine Airfoil Design
Gepubliceerd door: Publicatie datum:
ECN Windenergie 17-2-2011
ECN publicatienummer: Publicatie type:
ECN-W--11-005 Artikel wetenschap tijdschrift
Aantal pagina's:

Gepubliceerd in: Journal of Aircraft (AIAA), , 2011, Vol.Vol. 48, No. 1, p.248-255.

One important key element in the aerodynamic design of wind turbines is the use of specially tailored airfoils to increase the ratio of energy capture to the loading and thereby to reduce the cost of energy. This work is focused on the design of a wind turbine airfoil by using numerical optimization. First, the requirements for this class of airfoils are illustrated and discussed in order to have an exhaustive outline of the complexity of the problem. Then the optimization approach is presented; a gradient-based algorithm is used, coupled with RFOIL solver and a composite B├ęzier geometrical parameterization. A particularly sensitive point is the choice and implementation of constraints; to formalize the design requirements in the most complete and effective way, the effects of activating specific constraints are discussed. Finally, a numerical example regarding the design of a high-efficiency airfoil for the outer part of a blade is illustrated, and the results are compared with existing wind turbine airfoils.

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