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Generic Airfoil Trailing-Edge Noise Prediction using Stochastic Sound Sources from Synthetic Turbulence

Rautmann, Christof and Dierke, Jürgen and Ewert, Roland and Hu, Nan and Delfs, Jan Werner (2014) Generic Airfoil Trailing-Edge Noise Prediction using Stochastic Sound Sources from Synthetic Turbulence. In: 20th AIAA/CEAS Aeroacoustics Conference. 20th AIAA/CEAS Aeroacoustics Conference, 16.-20. Jun. 2014, Atlanta, USA. DOI: 10.2514/6.2014-3298

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Official URL: http://dx.doi.org/10.2514/6.2014-3298

Abstract

A Computational Aeroacoustic (CAA) study is conducted for the simulation of broad- band trailing-edge noise radiated from a NACA0012 airfoil and a cambered non-symmetrical DU96 airfoil for different ow conditions. The chosen simulation approach uses a Reynolds Averaged Navier-Stokes (RANS) solution to describe the turbulence around the airfoil. With a stochastic method time resolved synthetic turbulence uctuations are derived which then describe the unsteady sound sources used for acoustic perturbation equations (APE). The simulated broadband noise spectra are evaluated for different sets of input parameters to determine the sensitivity of the used method towards these parameters. Calculated values are compared to available measurement data to validate the underlying assumptions and to give advices on the best practice settings. It is essential for any proper realization of sound sources from a stochastic method that the RANS turbulence statistics are accurately realized. A length scale smoothing procedure is presented which remedies the problem of spurious peaks in the realized turbulence statistics. A study is pursued regarding the tur- bulent energy spectra realized by the stochastic turbulence reconstruction. Two different spectra (Gauss and Liepmann) are analyzed. A positive effect of higher energy levels of the Liepmann spectrum in certain frequency ranges on the simulated sound field can be shown.

Item URL in elib:https://elib.dlr.de/92580/
Document Type:Conference or Workshop Item (Speech)
Title:Generic Airfoil Trailing-Edge Noise Prediction using Stochastic Sound Sources from Synthetic Turbulence
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rautmann, Christofchristof.rautmann (at) dlr.deUNSPECIFIED
Dierke, Jürgenjuergen.dierke (at) dlr.deUNSPECIFIED
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Hu, Nannan.hu (at) dlr.deUNSPECIFIED
Delfs, Jan Wernerjan.delfs (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:20th AIAA/CEAS Aeroacoustics Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2014-3298
Status:Published
Keywords:Trailing Edge Noise CAA CFD Simulation BANC III
Event Title:20th AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, USA
Event Type:international Conference
Event Dates:16.-20. Jun. 2014
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:other
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Wind Energy (old), L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Rautmann, Christof
Deposited On:27 Nov 2014 11:29
Last Modified:27 Nov 2014 11:29

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