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Extensive Investigations on Radial Crack Formation in Labyrinth Seals of Aircraft Engines

Hühn, L.; Rieger, F.; Bleier, F.; Schwitzke, C.; Bauer, H.-J.; Behnisch, T.

Abstract (englisch):
Labyrinth seals are due to their non-contact function and their thermal resistance the state of the art in sealing technology for thermal turbomachinery such as jet engines. The purpose of labyrinth seals is to adjust or minimize the leakage between rotor and stator. However, because of transient flight manoeuvres and the resulting mechanical and thermal loads on the components, contact between rotating and stationary parts cannot be ruled out. The aim of this study is to extend the basic understanding of the mechanisms of hot crack formation in the components of a labyrinth seal during the rubbing process. Previous investigations at the Institute of Thermal Turbomachinery have shown that the thermally induced stress caused in connection with the thermal change of the material properties can lead to formation of the cracks in the seal fin. In order to get a deeper understanding of the complex crack initiation mechanisms, it is necessary to carry out fundamental experiments on simplified geometries. For this purpose, the stress conditions of a loaded labyrinth seal are applied to a cylindrical test specimen. It is fixed on both sides and subjected to thermo-cyclic load. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000093322
Veröffentlicht am 04.04.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-933226
KITopen-ID: 1000093322
Erschienen in Deutscher Luft- und Raumfahrtkongress, Friedrichshafen, Deutschland, 4 - 6 September 2018
Verlag Deutsche Gesellschaft für Luft- und Raumfahrt (DGLR)
Seiten 8 S.
Bemerkung zur Veröffentlichung Document-ID: 480120
Schlagwörter Labyrinth seal fin rubbing, radial crack formation, cyclic temperature load, experimental investigation, jet engines
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