the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Numerical airfoil catalogue including 360° airfoil polars and aeroacoustic footprints
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.
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RC1: 'Specific questions and comments', Gerard Cortina, 09 Jan 2018
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AC1: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
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AC1: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
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RC2: 'Comments', Anonymous Referee #2, 26 Jan 2018
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AC2: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
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AC2: 'Manuscript revised', Manfred Imiela, 16 Feb 2018


-
RC1: 'Specific questions and comments', Gerard Cortina, 09 Jan 2018
-
AC1: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
-
AC1: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
-
RC2: 'Comments', Anonymous Referee #2, 26 Jan 2018
-
AC2: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
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AC2: 'Manuscript revised', Manfred Imiela, 16 Feb 2018
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