Operating Conditions of Floating Ring Annular Seals
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Floating ring annular seals are used when large radial rotor displacements must be accommodated. They belong to a larger family of sealing devices that includes face seals and segmented seals. They all use carbon rings and have small axial or radial clearances that make them more effective than labyrinth seals. Compared to faces seals, segmented and floating ring annular seals can accommodate much larger radial and/or axial dynamic displacements of the rotor. On the other hand, at large pressure differences they might lock. In this case, they behave as eccentred annular seals with a non-negligible cross-coupling stiffness and all the accompanying drawbacks (destabilizing effect due to the decrease of the effective stiffness). The present work is based on the author’s experience in theoretical and experimental analysis of floating ring annular seals. Numerical and experimental results enlighten different operating regimes that may characterize the dynamic response of floating ring annular seals.
Arghir, Mihai; Mariot, Antoine (2018). Operating Conditions of Floating Ring Annular Seals. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station. Available electronically from