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Prediction of Porous Trailing Edge Noise Reduction Using Acoustic Jump-Conditions at Porous Interfaces

Rossian, Lennart and Faßmann, Benjamin and Ewert, Roland and Delfs, Jan Werner (2016) Prediction of Porous Trailing Edge Noise Reduction Using Acoustic Jump-Conditions at Porous Interfaces. In: 22nd AIAA/CEAS Aeroacoustics Conference. 21st AIAA/CEAS Aeroacoustics Conference, 30.Mai. - 03.Jun. 2016, Lyon.

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Abstract

Reduction of noise generated at geometric edges can be achieved by replacing solid material with porous inlays. The acoustic benefit for airfoil trailing edge noise was experimentally found to yield a reduction in sound pressure level of approximately 6 dB. Numerical methods are of interest to find optimal properties of the porosity. A successful method of modeling porous materials is the Volume-Averaging approach. In prior simulations, the prediction of the sound reduction was comparable to measurements over a limited frequency range. This has been enhanced to obtain simulation results which show a better agreement with the experimental findings. At the interface between the free fluid and the porous parts jump conditions are required to model the interaction of the acoustic and flow quantities in these two regimes when it comes to nonhomogeneous materials. This paper presents the perturbation formulation of a set of jump conditions for Computational Aeroacoustics (CAA), already known from Computational Fluid Dynamics (CFD). For the numerical implementation, a high-order compact boundary scheme is derived. Furthermore, the description of complex anisotropic materials is pursued. IIn a hybrid two-step CAA/CFD procedure, the turbulence statistics from the corre- sponding solution of the Volume-Averaged Navier-Stokes-Equations (VANS) is used to trigger vortices generating turbulent-boundary-layer trailing-edge noise (TBL-TEN).

Item URL in elib:https://elib.dlr.de/109362/
Document Type:Conference or Workshop Item (Speech)
Title:Prediction of Porous Trailing Edge Noise Reduction Using Acoustic Jump-Conditions at Porous Interfaces
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rossian, LennartLennart.Rossian (at) dlr.deUNSPECIFIED
Faßmann, BenjaminBenjamin.Fassmann (at) dlr.deUNSPECIFIED
Ewert, RolandRoland.Ewert (at) dlr.deUNSPECIFIED
Delfs, Jan WernerJan.Delfs (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:22nd AIAA/CEAS Aeroacoustics Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Aeroacoustics Porosity Numeric CAA Trailing-edge noise
Event Title:21st AIAA/CEAS Aeroacoustics Conference
Event Location:Lyon
Event Type:international Conference
Event Dates:30.Mai. - 03.Jun. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Rossian, Lennart
Deposited On:13 Dec 2016 11:42
Last Modified:13 Dec 2016 11:42

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