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Effects of riblet surfaces on boundary-layer-induced surface pressure fluctuations and surface vibration

Hu, Nan and Misol, Malte (2015) Effects of riblet surfaces on boundary-layer-induced surface pressure fluctuations and surface vibration. DAGA 2015, Nürnberg.

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Abstract

Riblet surfaces are an effective means for drag reduction. The skin friction can be reduced by up to 10% with a dimensionless rib spacing in a range of about 14- 18, applying the viscous length scale as normalization length. Apart from the drag reduction, the effect of riblet surfaces on surface pressure fluctuations and surface vibration might be of interest, especially for aircraft cabin noise. Experiments were performed at a plate configuration in the Acoustic Wind-Tunnel Braunschweig (AWB). Two riblet foils (102 μm and 150 μm rib spacing) and one foil without ribs but comparable mass were tested. The dimensionless rib spacing in the test is between 5 and 20.9. The results show no noticeable effect on the surface pressure fluctuations in the measurable frequency range (ca. 200 Hz-10 kHz) compared to the case without foils. However, riblet foils cause a vibration reduction of 1–2 dB compared to the foil without ribs. The greater stiffness of the riblet foils in the ribs direction might explain this behavior.

Item URL in elib:https://elib.dlr.de/95869/
Document Type:Conference or Workshop Item (Speech)
Title:Effects of riblet surfaces on boundary-layer-induced surface pressure fluctuations and surface vibration
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hu, Nannan.hu (at) dlr.deUNSPECIFIED
Misol, Maltemalte.misol (at) dlr.deUNSPECIFIED
Date:13 April 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:riblet surface, surface pressure fluctuations, surface vibration
Event Title:DAGA 2015
Event Location:Nürnberg
Event Type:national Conference
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 - Systems and Cabin
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Hu, Nan
Deposited On:13 Apr 2015 15:52
Last Modified:25 Jan 2016 14:17

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