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research-article

Rotordynamic characterization of a staggered labyrinth seal: experimental test data and comparison with predictions

[+] Author and Article Information
Filippo Cangioli

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
filippo.cangioli@polimi.it

Giuseppe Vannini

Baker Hughes, a GE company, Via Felice Matteucci 2, 50127, Florence, Italy
giuseppe.vannini@bhge.com

Paolo Pennacchi

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
paolo.pennacchi@polimi.it

Lorenzo Ciuchicchi

Baker Hughes, a GE company, 480 Allée Gustave Eiffel, Le Creusot, France
lorenzo.ciuchicchi@bhge.com

Leonardo Nettis

Baker Hughes, a GE company, Via Felice Matteucci 2, 50127, Florence, Italy
leonardo.nettis@bhge.com

Steven Chatterton

Politecnico di Milano, Via La Masa 1, 20156, Milan, Italy
steven.chatterton@polimi.it

1Corresponding author.

ASME doi:10.1115/1.4040688 History: Received June 22, 2018; Revised June 25, 2018

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 (c) 2018 by ASME
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