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Effects of the Back Plate Inner Diameter on the Frictional Heat Input and General Performance of Brush Seals

Hildebrandt, Manuel; Schwarz, Heiko; Schwitzke, Corina; Bauer, Hans-Jörg; Friedrichs, Jens

Abstract (englisch):
Reducing losses in the secondary air system of gas and steam turbines can significantly increase the efficiency of such machines. Meanwhile, brush seals are a widely used alternative to labyrinth seals. Their most valuable advantage over other sealing concepts is the very small gap between the sealing package and the rotor and thus reduced leakage mass flow. This small gap can be achieved due to the great radial flexibility 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. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000083104
Veröffentlicht am 29.05.2018
DOI: 10.3390/aerospace5020058
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2226-4310
KITopen-ID: 1000083104
Erschienen in Aerospace
Band 5
Heft 2
Seiten 58
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 25.05.2018
Schlagworte brush seal; frictional heat input; fence height; stiffness; blow-down; rubbing
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