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A flow-intrinsic trigger for capturing reconfigurations in buoyancy-driven flows in automated PIV

Mommert, Michael and Schiepel, Daniel and Schmeling, Daniel and Wagner, Claus (2019) A flow-intrinsic trigger for capturing reconfigurations in buoyancy-driven flows in automated PIV. Measurement Science and Technology, 30 (4), 045301. Institute of Physics (IOP) Publishing. DOI: 10.1088/1361-6501/ab0619 ISSN 0957-0233

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Official URL: https://iopscience.iop.org/article/10.1088/1361-6501/ab0619

Abstract

In order to acquire flow fields of rare reconfiguration events in buoyancy-driven flows, an automated flow-intrinsic trigger method for 3D particle image velocimetry (PIV) was developed. The trigger condition for initiating PIV is based on continuous multi-probe temperature measurements. The autonomously started PIV was realized with LED illumination and a controlled helium-filled soap bubble generator. The measured velocity fields reveal the transition between two different flow states in a mixed convection sample as proof of concept for this method. It is further proposed to consider the time series of all temperature probes for the trigger condition using Proper Orthogonal Decomposition (POD). It is demonstrated that the use of this POD-based trigger condition allows to detect flow events much earlier than the trigger based on single raw temperature signals.

Item URL in elib:https://elib.dlr.de/122315/
Document Type:Article
Title:A flow-intrinsic trigger for capturing reconfigurations in buoyancy-driven flows in automated PIV
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mommert, MichaelMichael.Mommert (at) dlr.dehttps://orcid.org/0000-0002-7817-3388
Schiepel, Danieldaniel.schiepel (at) dlr.dehttps://orcid.org/0000-0002-3703-3514
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:1 March 2019
Journal or Publication Title:Measurement Science and Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:30
DOI :10.1088/1361-6501/ab0619
Page Range:045301
Publisher:Institute of Physics (IOP) Publishing
ISSN:0957-0233
Status:Published
Keywords:conditional trigger, PIV, rare flow events, automated measurement, buoyancy-driven flows
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Mommert, Michael
Deposited On:11 Mar 2019 13:57
Last Modified:01 Mar 2020 03:00

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