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Experimental Investigation on the Rubbing Process of Labyrinth Seals Against Honeycomb Liners

Munz, Oliver; Hühn, Lisa; Schwitzke, Corina; Bauer, Hans-Jörg; Fischer, Tim; Ulan kyzy, Sonun

Abstract (englisch):
Sealing systems contribute significantly to the efficiency of turbomachinery. Small gap widths, which are important for low leakage mass flows in labyrinth seals, combined with thermal and mechanical expansion of the rotor can lead to contact with the stator. During these so-called rubbing processes, it is necessary to make an accurate prediction with respect to the performance and service life of the seal. For this purpose, the influence of relative velocity in the contact (up to 165ms−1) and incursion rate (up to 0.5 mms−1) on the resulting thermal and mechanical loads as well as wear mechanisms are studied for the rubbing process between an inclined labyrinth seal fin and a honeycomb segment. Furthermore, different axial configurations of the seal fin with respect to the honeycomb structure are considered. The system reacts very sensitively to a change of the seal fin position relative to the honeycomb structure. The incursion per revolution reflects a change of the wear mechanism from abrasive to plastic for a certain value. The results of this study contribute to the optimization of labyrinth seals and the development of new types of liner materials as well as geometries.

Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2021
Sprache Englisch
Identifikator ISBN: 978-0-7918-8421-8
KITopen-ID: 1000129285
Erschienen in ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, September 21–25, 2020, Virtual, Online. Vol.: 10A: Structures and Dynamics
Veranstaltung ASME Turbo Expo: Turbomachinery Technical Conference and Exposition (2020), Online, 21.09.2020 – 25.09.2020
Verlag American Society of Mechanical Engineers (ASME)
Seiten Pap. No:GT2020-15935
Bemerkung zur Veröffentlichung V10AT25A032
Vorab online veröffentlicht am 11.01.2021
Schlagwörter Honeycomb structures, Wear, Flow (Dynamics), Leakage, Optimization, Rotors, Sealing (Process), Service life (Equipment), Stators, Stress, Turbomachinery
Nachgewiesen in Scopus
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