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Numerical investigations on the rubbing process in labyrinth seals for full flight mission

Munz, Oliver; Hühn, Lisa; Bleier, Fabian; Bauer, Hans-Jörg

Abstract:
Labyrinth seals are a commonly used sealing technology to prevent and control leakage flows at rotor-stator interfaces in turbo machinery. Small clearances required by higher pressure ratios and the economical use of cooling air lead to potential rubbing events.
These may cause detrimental heat input into the rotating structure and can lead to severe damages. Honeycomb liners on the stator part tolerate rubbing events to a certain extent and therefore allow for smaller gap widths, which lead to minimal leakage.
A unique and independently developed one-dimensional numerical model is used to investigate critical rubbing conditions in a typical aircraft flight mission. It considers kinematic contact conditions, friction, heat conduction and abrasive and plastic wear.
This model allows the calculation of the loads, such as the contact pressures and temperatures on the components. First experimental investigations for an idealized contact between a metal foil, representing the honeycomb part, and a rotating seal fin are used to validate the model. Then, predictions of engine performance calculations are additionally used to calculate input parameters for the one-dimensional model. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000104233
Veröffentlicht am 23.03.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000104233
Erschienen in Proceedings of the 24th ISABE Conference
Veranstaltung 24th ISABE Conference (2019), Canberra, Australien, 22.09.2019 – 27.09.2019
Seiten Art.-Nr.: 2019-24268
Schlagwörter labyrinth seal, rubbing process, honeycomb, engine performance, aircraft flight mission, load prediction
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