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Time resolved, near wall PIV measurements in a high Reynolds number turbulent pipe flow

Willert, Christian and Klinner, Joachim and Soria, Julio and Amili, Omid and Eisfelder, Michael and Stanislas, Michel and Cuvier, Christoph and Graf, Norbert and Bellani, Gabrielle and Fiorini, Tommaso (2016) Time resolved, near wall PIV measurements in a high Reynolds number turbulent pipe flow. 69th Annual Meeting of the APS Division of Fluid Dynamics (APS-DFD), 20.-22. Nov. 2016, Portland, Oregon, USA.

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Official URL: http://meetings.aps.org/Meeting/DFD16/Session/G32.4

Abstract

We report on near wall measurements of a turbulent pipe flow at shear Reynolds numbers up to Re\tau =40000 acquired in the CICLoPE facility near Bologna, Italy. With 900 mm diameter and 110 m length the facility offers a well-established turbulent flow with viscous length scales ranging from y+ =85 μm at Re\tau =5000 to y+ =11 μm at Re\tau =40000 . These length scales can be resolved with a high-speed PIV camera at image magnification near unity. For the measurement the light of a high-speed, double-pulse laser is focused into a ≈300 μm thin light sheet that is introduced radially into the pipe. The light scattered by 1 μm water-glycerol droplet seeding is observed from the side by the camera via a thin high-aspect ratio mirror with a field of view covering 20mm in wall-normal and 5mm in stream-wise direction. Statistically converged velocity profiles could be achieved using 70000 samples per sequence acquired at low laser repetition rates (100Hz). Higher sampling rates of 10 kHz provide temporally coherent data from which frequency spectra can be derived. Preliminary analysis of the data shows a well resolved inner peak that grows with increasing Reynolds number. (Project funding through EuHIT - www.euhit.org)

Item URL in elib:https://elib.dlr.de/109908/
Document Type:Conference or Workshop Item (Speech)
Additional Information:FP7-Project EuHIT, Grant agreement no. 312778
Title:Time resolved, near wall PIV measurements in a high Reynolds number turbulent pipe flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Klinner, Joachimjoachim.klinner (at) dlr.deUNSPECIFIED
Soria, JulioMonash UniversityUNSPECIFIED
Amili, OmidMonash UniversityUNSPECIFIED
Eisfelder, MichaelMonash UniversityUNSPECIFIED
Stanislas, Michellaboratoire de mécanique de lille, franceUNSPECIFIED
Cuvier, Christophlml umr cnrs 8107, villeneuve d'ascq, franceUNSPECIFIED
Graf, NorbertInnolas GmbHUNSPECIFIED
Bellani, GabrielleUniv. BolognaUNSPECIFIED
Fiorini, TommasoUniv. BolognaUNSPECIFIED
Date:21 November 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Turbulenz, Grenzschicht, turbulent pipe flow, boundary layer, turbulence, PIV, particle Image velocimetry, space-time correlation
Event Title:69th Annual Meeting of the APS Division of Fluid Dynamics (APS-DFD)
Event Location:Portland, Oregon, USA
Event Type:international Conference
Event Dates:20.-22. Nov. 2016
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
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:04 Jan 2017 11:45
Last Modified:31 Jul 2019 20:07

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