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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, Christophe and Bellani, Gabrielle and Fiorini, Tommaso and Talamelli, Alessandro (2017) Time resolved, near wall PIV measurements in a high Reynolds number turbulent pipe flow. 16th European Turbulence Conference (ETC16), 21.-24. Aug. 2017, Stockholm, Schweden.

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Official URL: http://www.etc16.se/

Abstract

We report on near wall measurements of a turbulent pipe flow at shear Reynolds numbers up to Re = 40000 acquired in the CICLoPE facility near Bologna, Italy. With 900 mm diameter and 110m length the facility offers a well-established turbulent flow with viscous length scales ranging from y+ = 85 µm at Re = 5000 to y+ = 11 µm at Re = 40000. These length scales can be resolved with a high-speed PIV camera at image magnification near unity. For the PIV measurements the light of a high-speed, double-pulse laser is focused into an approximately 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 cameravia a 1mm thin high-aspect ratio mirror with a field of view covering 20mm in wall-normal and 5mm in stream-wise direction. Facility vibrations of up to 50 µm peak-to-peak could be accounted for with image processing thereby providing measurements with a spatial resolution at the wall unit level. Statistically converged velocity profiles could be achieved using up to 70000 samples per sequence acquired at low laser repetition rates (100 Hz). 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 shear Reynolds number.

Item URL in elib:https://elib.dlr.de/113815/
Document Type:Conference or Workshop Item (Speech)
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, Christophelaboratoire de mécanique de lille, franceUNSPECIFIED
Bellani, Gabrielleuniv. bolognaUNSPECIFIED
Fiorini, Tommasouniv. bolognaUNSPECIFIED
Talamelli, Alessandrouniv. bolognaUNSPECIFIED
Date:24 August 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:turbulent pipe flow, near wall turbulence, turbulent boundary layer, partilce image velocimetry, PIV
Event Title:16th European Turbulence Conference (ETC16)
Event Location:Stockholm, Schweden
Event Type:international Conference
Event Dates:21.-24. Aug. 2017
Organizer:European Mechanics Society & KTH Mechanics
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 Sep 2017 10:02
Last Modified:31 Jul 2019 20:11

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