<div class="csl-bib-body">
<div class="csl-entry">Krismer, L. (2017). <i>Influence of passive tip-injection on the excitation forces in axial turbines with shrouded blades : by Lukas Krismer</i> [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2017.29189</div>
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dc.identifier.uri
https://doi.org/10.34726/hss.2017.29189
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/7370
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dc.description
Abweichender Titel nach Übersetzung der Verfasserin/des Verfassers
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dc.description.abstract
In turbomachinery the leakage of mass flow through the clearance between the rotor blade tips and the casing is one of the main sources of loss. In order to reduce this form of loss, the flow resistance of the blade tip clearance can be increased geometrically by winglets, squealers and shrouds or aerodynamically by a fluidic jet barrier. At the department of Fluid-Flow Machinery of the Institute for Energy Systems and Thermodynamics at the Technische Universität Wien passive tip-injection has been presented as a method of increasing the flow resistance of blade tip clearances in turbomachinery. This method extracts mass flow at the rotor blade leading edge which is then guided through the blade and injected into the blade tip clearance. Research shows, that passive tip-injection has the potential of significantly reducing the tip-leakage mass flow and improving the mixing conditions of the leakage mass flow with the main flow considerably. The term tip excitation labels aerodynamically induced cross forces acting on the rotor of turbomachinery depending on the tip-leakage mass flow. These forces have the potential of inducing an instable whirling motion of the rotor above a limiting power level of the turbomachine, which renders further operation impossible. Two effects are known to be the main reasons of tip excitation in turbomachinery: The variable tip-leakage mass flow of an eccentric rotor leading to a variation in tangential forces on the rotor blades and the pressure variation in the tip gap of an eccentric rotor under swirled flow conditions. Both result in a cross force perpendicular to the direction of displacement of the rotor. This thesis investigates the influence of passive tip-injection on the tip excitation in shrouded axial turbine stages. Therefore an analytical model for the tip-leakage mass flow and the pressure in the tip gap of a shrouded turbine rotor with passive tip-injection under swirled flow conditions is developed and evaluated numerically. Subsequently the resulting cross forces on the rotor are calculated. It is shown, that passive tip-injection has the potential of decreasing the tip excitation cross forces by reducing the tip-leakage mass flow and positively influencing the flow angles and the pressure distributions in the tip clearance.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
Axialturbine
de
dc.subject
Deckbandbeschaufelung
de
dc.subject
Labyrinthdichtung
de
dc.subject
passive Einblasung
de
dc.subject
Spalterregung
de
dc.subject
axial turbine
en
dc.subject
shrouded blades
en
dc.subject
labyrinth seal
en
dc.subject
passive tip-injection
en
dc.subject
tip excitation
en
dc.title
Influence of passive tip-injection on the excitation forces in axial turbines with shrouded blades : by Lukas Krismer
en
dc.title.alternative
Einfluss passiver Einblasung auf die Spalterregung in axialen Turbinenstufen mit Deckbandbeschaufelung
de
dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.identifier.doi
10.34726/hss.2017.29189
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dc.contributor.affiliation
TU Wien, Österreich
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dc.rights.holder
Lukas Krismer
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dc.publisher.place
Wien
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tuw.version
vor
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tuw.thesisinformation
Technische Universität Wien
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dc.contributor.assistant
Willinger, Reinhard
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tuw.publication.orgunit
E302 - Institut für Energietechnik und Thermodynamik
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dc.type.qualificationlevel
Diploma
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dc.identifier.libraryid
AC14475531
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dc.description.numberOfPages
91
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dc.identifier.urn
urn:nbn:at:at-ubtuw:1-103058
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dc.thesistype
Diplomarbeit
de
dc.thesistype
Diploma Thesis
en
dc.rights.identifier
In Copyright
en
dc.rights.identifier
Urheberrechtsschutz
de
tuw.advisor.staffStatus
staff
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tuw.assistant.staffStatus
staff
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item.mimetype
application/pdf
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item.grantfulltext
open
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item.languageiso639-1
en
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item.fulltext
with Fulltext
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item.cerifentitytype
Publications
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item.openaccessfulltext
Open Access
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item.openairetype
master thesis
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item.openairecristype
http://purl.org/coar/resource_type/c_bdcc
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crisitem.author.dept
E325 - Institut für Mechanik und Mechatronik
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crisitem.author.parentorg
E300 - Fakultät für Maschinenwesen und Betriebswissenschaften