Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2017-5
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research articles
01 Feb 2017
Review status
A revision of this discussion paper is under review for the journal Wind Energy Science (WES).
Design of advanced airfoil for stall-regulated wind turbines
Francesco Grasso1, Domenico Coiro2, Nadia Bizzarrini2, and Giuseppe Calise2 1Aerodynamix, Napoli, 80128, Italy
2Dip. Ingegneria Industriale, Università di Napoli FedericoII, Napoli, 80123, Italy
Abstract. Nowadays, all the modern MW-class wind turbines make use of pitch control to optimize the rotor performance and control the turbine. However, for kW-range machines, stall-regulated solutions are still attractive and largely used for their simplicity and robustness. On the design phase, the aerodynamics plays a crucial role, especially concerning the selection/design of the necessary airfoils. This is because the airfoil performance should guarantee high wind turbine performance, but also the needed machine control capabilities. In the present work, the design of a new airfoil dedicated for stall machines is discussed. The design strategy makes use of numerical optimization scheme where a gradient-based algorithm is coupled with XFOIL code and an original Bezier-curves-based parameterization to describe the airfoil shape. The performances of the new airfoil are compared in free and fixed transition conditions. In addition, the performance of the rotor is analysed comparing the impact of the new geometry with alternative candidates. The results show that the new airfoil offers better performance and control than existing candidates do.

Citation: Grasso, F., Coiro, D., Bizzarrini, N., and Calise, G.: Design of advanced airfoil for stall-regulated wind turbines, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-5, in review, 2017.
Francesco Grasso et al.
Francesco Grasso et al.
Francesco Grasso et al.

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Short summary
Despite the majority of the wind turbine market is focused on large pitch-regulated machines, small stall-regulated are still attractive because of their simplicity and robustness. This work is focused on aerodynamic section design for these machines and its impact on overall performance. The big challenge faced, was that, beside the energy produced to be maximized, the control of the machine depends on the section design. The results showed however big performance gain and machine control.
Despite the majority of the wind turbine market is focused on large pitch-regulated machines,...
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