Suryadi, Alexandre (2018) Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers. In: 24th AIAA/CEAS Aeroacoustics Conference, 2018. 2018 AIAA/CEAS Aeroacoustics Conference, 2018-06-25 - 2018-06-29, Atlanta, Georgia. United States of America. doi: 10.2514/6.2018-3937. ISBN 978-162410560-9.
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Official URL: http://dx.doi.org/10.2514/6.2018-3937
Abstract
A similarity model for separated turbulent boundary layer is proposed as a function of the velocity associated with the maximum local mean shear $U_m = \tau_m /\rho$. A linear relation between mean velocity and reduced wall-normal coordinate is observed for approximately 40–50% of the boundary layer height. A corresponding similarity model of the far-field sound pressure levels was also derived. The proposed scaling law shows less variability than the classical trailing-edge noise scaling within a range of the freestream velocity and airfoil’s angle of attack. In comparison to classical trailing-edge noise, the sound pressure level scaling of separated flow is tuned by a factor of $U_m^2$, a non-dimensional velocity variable associated with the maximum mean shear stress in the separated boundary layer.
Item URL in elib: | https://elib.dlr.de/122939/ | ||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||
Title: | Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers | ||||||||
Authors: |
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Date: | 2018 | ||||||||
Journal or Publication Title: | 24th AIAA/CEAS Aeroacoustics Conference, 2018 | ||||||||
Refereed publication: | Yes | ||||||||
Open Access: | Yes | ||||||||
Gold Open Access: | No | ||||||||
In SCOPUS: | Yes | ||||||||
In ISI Web of Science: | No | ||||||||
DOI: | 10.2514/6.2018-3937 | ||||||||
ISBN: | 978-162410560-9 | ||||||||
Status: | Published | ||||||||
Keywords: | flow separation, self-similar model | ||||||||
Event Title: | 2018 AIAA/CEAS Aeroacoustics Conference | ||||||||
Event Location: | Atlanta, Georgia. United States of America | ||||||||
Event Type: | international Conference | ||||||||
Event Start Date: | 25 June 2018 | ||||||||
Event End Date: | 29 June 2018 | ||||||||
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 (old) | ||||||||
Location: | Braunschweig | ||||||||
Institutes and Institutions: | Institute for Aerodynamics and Flow Technology > Technical Acoustics | ||||||||
Deposited By: | Suryadi, Alexandre | ||||||||
Deposited On: | 10 Dec 2018 16:34 | ||||||||
Last Modified: | 24 Apr 2024 20:26 |
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