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Experimental Investigation on the Influence of Geometrical Parameters on the Frictional Heat Input and Leakage performance of Brush Seals

Hildebrandt, Manuel; Schwitzke, Corina; Bauer, Hans-Jörg

Abstract (englisch):
Because of the superior sealing characteristics compared to labyrinth seals, brush seals found an increased spread in turbomachinery in recent years. Their outstanding sealing performance results mainly from their flexibility. Thus, a very small gap between the rotor and bristle package can be obtained without running the risk of severe detrimental deterioration in case of rubbing. Rubbing between rotor and seal during operation might occur as a result of e.g. an unequal thermal expansion of the rotor and stator or a rotor elongation due to centrifugal forces or manoeuvre forces. Thanks to the flexible structure of the brush seal the contact forces during a rubbing event are reduced, however the frictional heat input can still be considerable. Particularly in aircraft engines with their thin and lightweight rotor structures the permissible material stresses can easily be exceeded by an increased heat input and thus harm the engine’s integrity. The geometry of the seal has a decisive influence on the resulting contact forces and consequently the heat input. The complex interactions between the geometric parameters of the seal and the heat input and leakage characteristics are not yet fully understood. ... mehr

DOI: 10.1115/GT2017-63423
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2017
Sprache Englisch
Identifikator ISBN: 978-0-7918-5088-6
KITopen-ID: 1000072008
Erschienen in Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA, June 26-30, 2017. Volume 5B
Verlag The American Society of Mechanical Engineers (ASME)
Seiten 39-50
Bemerkung zur Veröffentlichung Paper No. GT2017-63423
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