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High Resolution Boundary Layer Measurements on a Wing-Fuselage Model

Jeon, David and Willert, Christian and Damian, Hirsch and Gharib, Morteza (2018) High Resolution Boundary Layer Measurements on a Wing-Fuselage Model. 71st Annual Meeting of the APS Division of Fluid Dynamics, 18.-20. Nov. 2018, Atlanta, GA, USA.

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Official URL: http://meetings.aps.org/Meeting/DFD18/Session/D30.10


A persistent problem in boundary layer experiments has been the inability to experimentally measure close enough to the wall the resolve the near wall region. This can be because a physical probe, like a hot wire anemometer, is larger than the near wall scales or because an optical probe, like laser Doppler velocimetry, lacks the resolution to get close enough to the wall. A variation on particle image velocimetry (PIV), has been developed by one of us (Willert), where a long-range micro PIV setup is used to resolve down to sub-layer scales in a turbulent boundary layer. This type of micro PIV setup was used on a semi-span wing-fuselage model to measure the boundary layer on the fuselage ahead of the wing at Re_\theta up to 2700, where the sub-layer could be characterized down to y^+ \approx 1. Since this is a PIV based technique, the measurement includes not just the mean profile, but also the variance and co-variance terms. The extension of the profile into the sub-layer means that the wall shear stress can be directly checked against the Clauser method. This talk will include an overview of the technique and challenges of implementing it in this setting, as well as preliminary results from wind tunnel testing.

Item URL in elib:https://elib.dlr.de/126277/
Document Type:Conference or Workshop Item (Speech)
Title:High Resolution Boundary Layer Measurements on a Wing-Fuselage Model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jeon, DavidCalifornia Institute of TechnologyUNSPECIFIED
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Damian, HirschCalifornia Institute of TechnologyUNSPECIFIED
Gharib, MortezaCalifornia Institute of Technologyhttps://orcid.org/0000-0003-0754-4193
Date:November 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:wing-body juncture, separated flow, particle Image velocimetry, wall shear stress measurement, long-range Imaging, turbulent boundary layer
Event Title:71st Annual Meeting of the APS Division of Fluid Dynamics
Event Location:Atlanta, GA, USA
Event Type:international Conference
Event Dates:18.-20. Nov. 2018
Organizer:American Physical Society
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:29 Jan 2019 11:44
Last Modified:29 Jan 2019 11:44

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