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dc.contributor.author
Lazzi Gazzini, Sebastiano
dc.contributor.author
Schädler, Rainer
dc.contributor.author
Kalfas, Anestis I.
dc.contributor.author
Abhari, Reza S.
dc.contributor.author
Hohenstein, Sebastian
dc.contributor.author
Schmid, Gregor
dc.contributor.author
Lutum, Ewald
dc.date.accessioned
2018-01-25T15:30:36Z
dc.date.available
2018-01-19T07:53:58Z
dc.date.available
2018-01-25T15:30:36Z
dc.date.issued
2017
dc.identifier.other
10.22261/f29zwy
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/231143
dc.identifier.doi
10.3929/ethz-b-000231143
dc.description.abstract
In order to gain in cycle efficiency, turbine inlet temperatures tend to rise, posing the challenge for designers to cool components more effectively. Purge flow injection through the rim seal is regularly used in gas turbines to limit the ingestion of hot air in the cavities and prevent overheating of the disks and shaft bearings. The interaction of the purge air with the main flow and the static pressure field of the blade rows results in a non-homogenous distribution of coolant on the passage endwall which poses questions on its effect on endwall heat transfer. A novel measurement technique based on infrared thermography has been applied in the rotating axial turbine research facility LISA of the Laboratory for Energy Conversion (LEC) of ETH Zürich. A 1.5 stage configuration with fully three-dimensional airfoils and endwall contouring is integrated in the facility. The effect of different purge air mass flow rates on the distribution of the heat transfer quantities has been observed for the rated operating condition of the turbine. Two-dimensional distributions of Nusselt number and adiabatic wall temperature show that the purge flow affects local heat loads. It does so by acting on the adiabatic wall temperature on the suction side of the passage until 30% of the axial extent of the rotor endwall. This suggests the possibility of effectively employing purge air also as rotor platform coolant in this specific region. The strengthening of the secondary flows due to purge air injection is observed, but plays a negligible role in varying local heat fluxes. For one test case, experimental data is compared to high-fidelity, unsteady Reynolds-Averaged Navier–Stokes simulations performed on a model of the full 1.5 stage configuration.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Global Power and Propulsion Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.title
Effect of purge air on rotor endwall heat transfer of an axial turbine
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2017-10-12
ethz.journal.title
Journal of the Global Power and Propulsion Society
ethz.journal.volume
1
en_US
ethz.pages.start
211
en_US
ethz.pages.end
223
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.publication.place
Zug
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02627 - Institut für Energietechnik / Institute of Energy Technology::03548 - Abhari, Reza S. / Abhari, Reza S.
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02627 - Institut für Energietechnik / Institute of Energy Technology::03548 - Abhari, Reza S. / Abhari, Reza S.
en_US
ethz.date.deposited
2018-01-19T07:53:59Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-01-25T15:30:44Z
ethz.rosetta.lastUpdated
2018-11-06T07:27:32Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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