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Experimental and Numerical Investigation of a Multi-Jet Impingement Cooling Configuration

Schroll, Michael and Klinner, Joachim and Müller, Martin and Matha, Marcel and Hilfer, Michael and Tabassum, Sadiya and Morsbach, Christian and Brakmann, Robin and Willert, Christian (2022) Experimental and Numerical Investigation of a Multi-Jet Impingement Cooling Configuration. 20th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics, 2022-07-11 - 2022-07-14, Lisbon, Portugal. ISBN 978-989-53637-0-4.

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Official URL: https://www.lisbonsimposia.org/


In order to protect turbine blades from thermal damage or thermally induced aging, internal impingement cooling has found common use throughout engine design, both in stationary gas turbines as well as aircraft engines, but also finds applications in other areas requiring cooling. The present investigation is focused on a generic impingement cooling configuration that can be easily modelled with computational fluid dynamics (CFD) and at the same time can be studied in detail experimentally. The acquired experimental data can be directly used for the validation of the CFD simulations, ultimately allowing their application in more complex, realistic configurations where experimental investigations become prohibitively expensive or otherwise impossible. The investigated configuration consists of 9 evenly spaced jets of Reynolds number Re D = 10000 issuing into a square channel that is sealed at one end. The jets directly impinge on a uniformly heated target plate. With previous work on similar configurations well described in literature, the focus of the present contribution is to further exploit the potentials offered by snap-shot based and time-resolved measurements. The flow field within the channel is characterized with both conventional, snap-shot particle image velocimetry (PIV) as well as with high-speed, time-resolved PIV (TR-PIV) to, respectively, capture overview data as well as detailed information on temporally evolving flow structures. In addition, measurements of the unsteady surface temperature distribution on the heated channel wall are performed by means of a newly developed unsteady temperature sensitive paint (iTSP) measurement technique. The interaction of the turbulent jets with the wall and with its neighbors is studied in detail using correlation and spectral analysis as well as modal decomposition. Where possible, this is supplemented with corresponding data obtained from numerical modelling. None of the applied postprocessing methods reveal a significant interaction between jets suggesting that the jet-driven dynamics of heat transfer at the wall are restricted to their immediate vicinity which may simplify the requirements on numerical models of similar cooling configurations.

Item URL in elib:https://elib.dlr.de/187567/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental and Numerical Investigation of a Multi-Jet Impingement Cooling Configuration
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schroll, MichaelUNSPECIFIEDhttps://orcid.org/0000-0003-0736-546XUNSPECIFIED
Klinner, JoachimUNSPECIFIEDhttps://orcid.org/0000-0003-2709-9664UNSPECIFIED
Matha, MarcelUNSPECIFIEDhttps://orcid.org/0000-0001-8101-7303UNSPECIFIED
Hilfer, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-2881-7130UNSPECIFIED
Morsbach, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-6254-6979UNSPECIFIED
Willert, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-1668-0181UNSPECIFIED
Date:11 July 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:turbine blade cooling, jet impingement, flow (dynamics), heat transfer, jets, cross-flow, temperature, turbulence, computational fluid dynamics, RANS, large eddy simulation, LES, Reynolds-averaged Navier-Stokes equations, high-speed PIV, time-resolved PIV, unsteady temperature sensitive paint, iTSP
Event Title:20th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Start Date:11 July 2022
Event End Date:14 July 2022
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Gas Turbine
Location: Göttingen , Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Institute of Propulsion Technology > Numerical Methodes
Institute of Propulsion Technology > Turbine
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Willert, Dr.phil. Christian
Deposited On:15 Aug 2022 15:34
Last Modified:24 Apr 2024 20:48

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