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Rotordynamic Characterization of a Staggered Labyrinth Seal: Experimental Test Data and Comparison With Predictions

[+] Author Affiliations
Filippo Cangioli, Paolo Pennacchi, Steven Chatterton

Politecnico di Milano, Milan, Italy

Giuseppe Vannini, Leonardo Nettis

Baker Hughes, a GE company, Florence, Italy

Lorenzo Ciuchicchi

Baker Hughes, a GE company, Le Creusot, France

Paper No. GT2018-75072, pp. V07BT34A003; 13 pages
doi:10.1115/GT2018-75072
From:
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5114-2
  • Copyright © 2018 by ASME

abstract

As well known, the stability assessment of turbomachines is strongly related to internal sealing components. For instance, labyrinth seals are widely used in compressors, steam and gas turbines and pumps to control the clearance leakage between rotating and stationary parts, owing to their simplicity, reliability and tolerance to large thermal and pressure variations. Labyrinth seals working principle consists in reducing the leakage by imposing tortuous passages to the fluid that are effective on dissipating the kinetic energy of the fluid from high-pressure regions to low-pressure regions. Conversely, labyrinth seals could lead to dynamics issues. Therefore, an accurate estimation of their dynamic behavior is very important.

In this paper, the experimental results of a long-staggered labyrinth seal will be presented. The results in terms of rotordynamic coefficients and leakage will be discussed as well as the critical assessment of the experimental measurements.

Eventually, the experimental data are compared to numerical results obtained with the new bulk-flow model (BFM) introduced in this paper.

Copyright © 2018 by ASME

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