Contribution
CFD-CAA Simulation of Geometrically Resolved Porous Trailing Edge
* Presenting author
Abstract:
Porous trailing edges (TE) are known to attenuate the overall sound emission of airfoils. The low frequency levels are reduced, whereas at high frequencies additional noise may be produced. We will present simulation results of both solid and porous TE valid over the complete frequency range, showing the sound reduction as well as its increase at the respective frequencies.The method applied is a cost efficient wall modeled incompressible LES together with the hydrodynamic/acoustic splitting approach to predict the sound. The porous material is geometrically resolved. Test case is a NACA profile with a porous TE of defined shape (Teruna et al., JFM 2021). The published measurement data are used for validation of flow structure and sound emission.The present work is an extension of previous work, which was modelling the porous material as equivalent fluid and therefore was not able to show the additional high frequency sound emission.Produced and absorbed sound power are analyzed based on acoustic energy balance and serve as a starting point to gain insight in the mechanisms responsible especially for the high frequency effects which are not yet fully understood.