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-2017-39
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
12 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Aerodynamic Performance of the NREL S826 Airfoil in Icing Conditions
Julie Krøgenes1, Lovisa Brandrud1, Richard Hann2, Jan Bartl1, Tania Bracchi1, and Lars Sætran1 1Department of Energy and Process Engineering, Norwegian University of Science and Technology
2Department of Engineering Cybernetics, Norwegian University of Science and Technology
Abstract. The demand for wind power is rapidly increasing, creating opportunities for wind farm installations in more challenging climates. Cold climate areas, where ice accretion can be an issue, are often sparsely populated and have high wind energy potential. Icing may lead to severely reduced aerodynamic performance and thereby reduced power output. To reach a greater understanding of how icing affects the aerodynamics of a wind turbine blade, three representative icing cases; rime ice, glaze ice and a mixed ice, were defined and investigated experimentally and computationally. Experiments at Re = 1.0 × 105–4.0 × 105 were conducted in the low-speed wind tunnel at NTNU on a two dimensional wing with applied 3D-printed ice shapes, determining lift, drag and surface pressure distributions. Computational results, obtained from the Reynolds Averaged Navier–Stokes fluid dynamics code FENSAP, complement the experiments. Measured and predicted data show a reduction in lift for all icing cases. Most severe is the mixed ice case, with a lift reduction of up to 30 % in the linear lift area, compared to a clean reference airfoil. Computational results show an under-prediction in maximum lift of 7–18 % compared to experimental values. Curvature and tendencies for both lift and drag show good agreement between simulations and experiment.

Citation: Krøgenes, J., Brandrud, L., Hann, R., Bartl, J., Bracchi, T., and Sætran, L.: Aerodynamic Performance of the NREL S826 Airfoil in Icing Conditions, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-39, in review, 2017.
Julie Krøgenes et al.
Julie Krøgenes et al.
Julie Krøgenes et al.

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Short summary
Leading edge ice accretion causes significant performance degradation to wind power installations in cold climate areas. This study focuses on the effect of three typical ice shapes; rime ice, glaze ice and a mixed ice. Experiments were conducted in the low speed wind tunnel at NTNU and compared with ANSYS Fluent CFD analyses. Results show a reduction on lift and an increase in drag for all ice cases, most severely for the mixed ice with it's horn-like shape.
Leading edge ice accretion causes significant performance degradation to wind power...
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