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-2017-51
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
22 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Numerical airfoil catalogue including 360° airfoil polars and aeroacoustic footprints
Manfred Imiela, Benjamin Faßmann, Gerrit Heilers, and Gunther Wilke Institute of Aerodynamics and Flow Technology, DLR, Braunschweig, 38102, Germany
Abstract. A methodology is presented for generating 360° airfoil polars and aeroacoustic characteristics by means of CFD and CAA. The aerodynamic procedure is validated against experimental data of the well-known airfoils DU-93-W-210 and DU-97-W-300. While a better prediction of the aerodynamic coefficients in the range of −30° and 30° is achieved by a combination of the k-ω SST turbulence model and a C-topology mesh, for the remaining angles of attack more confidence is gained with the SA negative turbulence model in combination with an O-topology mesh. Therefore the two data sets are subsequently fused to one complete data set using a kriging interpolation approach. The result of ten different airfoils using the proposed method is presented. For providing the aeroacoustic characteristics for a wide operation range four computations and a bilinear interpolation are needed, since the aeroacoustic is dependent on the Mach and Reynolds number. The bilinear interpolation approach is verificated by a comparison between the originally simulated and the emulated result at a fifth computational set for six different airfoils. The corresponding overall sound pressure level (OASPL) for four angles of attack for these airfoils is presented and the difference between a fully turbulent computation and simulations with fixed transition is assessed. The aeroacoustic results further include high-fidelity directivity functions.

Citation: Imiela, M., Faßmann, B., Heilers, G., and Wilke, G.: Numerical airfoil catalogue including 360° airfoil polars and aeroacoustic footprints, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2017-51, in review, 2017.
Manfred Imiela et al.
Manfred Imiela et al.
Manfred Imiela et al.

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