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Numerical airfoil catalogue including 360° airfoil polars and aeroacoustic footprints

Imiela, Manfred and Faßmann, Benjamin and Heilers, Gerrit and Wilke, Gunther Andreas (2017) Numerical airfoil catalogue including 360° airfoil polars and aeroacoustic footprints. Wind Energy Science Conference, 26.-29.06.2017, Kopenhagen.

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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-w 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.

Item URL in elib:https://elib.dlr.de/117931/
Document Type:Conference or Workshop Item (Speech)
Title:Numerical airfoil catalogue including 360° airfoil polars and aeroacoustic footprints
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Imiela, ManfredUNSPECIFIEDhttps://orcid.org/0009-0002-1410-1243UNSPECIFIED
Wilke, Gunther AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-1915-5307UNSPECIFIED
Date:27 June 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Wind energy, aerodynamic, acoustic, polar, data fusion
Event Title:Wind Energy Science Conference
Event Location:Kopenhagen
Event Type:international Conference
Event Dates:26.-29.06.2017
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, BS
Deposited By: Imiela, Dr. Manfred
Deposited On:09 Mar 2018 09:33
Last Modified:12 Mar 2018 09:49

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