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CAA-RPM prediction and validation of slat setting influence on broadband high-lift noise generation

Ewert, Roland and Dierke, Jürgen and Pott-Pollenske, Michael and Appel , Christina and Emunds, Rolf and Sutcliffe, Mark (2010) CAA-RPM prediction and validation of slat setting influence on broadband high-lift noise generation. 16th AIAA/CEAS Aeroacoustics Conference, 7.-9. Jun. 2010, Stockholm, Schweden.

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Abstract

Broadband sound generated at the slat of a three-element high-lift wing is simulated with a CAA method. Especially, the effect of different slat and gap settings is studied and the results are validated with measurements. The applied method rests on the use of steady Reynolds Averaged Navier-Stokes (RANS) simulation to prescribe the time-averaged motion of turbulent flow. By means of synthetic turbulence generated with the Random Particle-Mesh (RPM) method the steady one-point statistics (e.g. turbulent kinetic energy) and turbulent length- and time-scales of RANS are translated into fluctuations with statistics that very accurately reproduce the spatial target distributions of RANS. The synthetic fluctuations are used to prescribe sound sources which drive linear acoustic perturbation equations. The whole approach represents a methodology to solve statistical noise theory with state-of-the-art Computational Aeroacoustics (CAA) tools in the timedomain. The comparison with experiments are conducted for four selected settings, chosen from a matrix comprising in total 43 individual slat-gap and overlap combinations. CAA simulations are performed for all matrix positions. The CAA computations are obtained as blind predictions prior to the measurements conducted in the AWB wind tunnel. Good agreement of the noise trends are found between CAA and experiments. The difference in level between the selected configurations is obtained qualitatively and quantitatively by CAA.

Item URL in elib:https://elib.dlr.de/68333/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:CAA-RPM prediction and validation of slat setting influence on broadband high-lift noise generation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Dierke, Jürgenjuergen.dierke (at) dlr.deUNSPECIFIED
Pott-Pollenske, Michaelmichael.pott-pollenske (at) dlr.deUNSPECIFIED
Appel , Christinachristina.appel (at) dlr.deUNSPECIFIED
Emunds, RolfAirbus DeutschlandUNSPECIFIED
Sutcliffe, MarkAirbus DeutschlandUNSPECIFIED
Date:2010
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:AIAA Paper
Status:Published
Keywords:CAA, APE, RPM, TIMPAN, Slat-Noise, Validation, Slat Setting
Event Title:16th AIAA/CEAS Aeroacoustics Conference
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:7.-9. Jun. 2010
Organizer:AIAA/CEAS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Ewert, Dr.-Ing. Roland
Deposited On:18 Jan 2011 09:52
Last Modified:18 Jan 2011 09:52

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