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Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers

Suryadi, Alexandre (2019) Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers. AIAA Journal, 57 (6), pp. 2435-2446. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.J057721 ISSN 0001-1452

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Official URL: https://doi.org/10.2514/1.J057721

Abstract

This Paper proposes a similarity model for separated turbulent boundary layers as a function of the outer flow parameters, the velocity associated with the maximum local mean shear $U_m=\sqrt{\tau_m/\rho}$, and the reduced wall-normal coordinate. By using this similarity model, the outer layer profiles are scaled for approximately 70-80% of the boundary layer height. A corresponding similarity model of the far-field sound pressure levels and surface pressure autospectrum was derived. The proposed scaling shows less variability than the canonical trailing-edge noise scaling within a range of the freestream velocity and airfoil's angle of attack. The scaling of the surface pressure autospectrum reveals that the viscous and inertial time scales are of the same order of magnitude, which suggests strong turbulent dissipation in the separated turbulent boundary layer that results in the steep rolloff of the autospectrum in the midfrequency range.

Item URL in elib:https://elib.dlr.de/129637/
Document Type:Article
Title:Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Suryadi, AlexandreAlexandre.Suryadi (at) dlr.dehttps://orcid.org/0000-0002-5129-5510
Date:9 April 2019
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:57
DOI :10.2514/1.J057721
Page Range:pp. 2435-2446
Editors:
EditorsEmail
Lavoie, PhilippUNSPECIFIED
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:turbulent boundary layer, Flow separation, self-similarity,
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
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Suryadi, Alexandre
Deposited On:29 Oct 2019 13:57
Last Modified:29 Oct 2019 13:57

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