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A Reduced-Order Model for Annular Labyrinth Seals Based on Proper Orthogonal Decomposition

[+] Author Affiliations
Hanxiang Jin, Alexandrina Untaroiu

Virginia Polytechnic Institute and State University, Blacksburg, VA

Paper No. IMECE2016-67086, pp. V007T09A038; 8 pages
doi:10.1115/IMECE2016-67086
From:
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids Engineering
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5061-9
  • Copyright © 2016 by ASME

abstract

Labyrinth seals are commonly used in pumps, compressors, and turbines to minimize the leakage of working fluid. They typically have a series of circular or rectangular shaped grooves designed to enhance the kinetic energy dissipation, consequently reducing the leakage rate. In this study a reduced order model is proposed for non-contacting annular labyrinth seals to describe leakage phenomenon and better understand the flow pattern as well as the energy distribution.

Both 2D and 3D reduced order models (ROM) were developed based on the transient CFD simulation results for a labyrinth seal with 20 rounded grooves circumferentially distributed. The matrix of cases analyzed consists of full order 2D and 3D models, as well as reduced order 2D and 3D models. The eigenvalues from the ROM matrix derived using Proper Orthogonal Decomposition (POD) and Snapshot techniques includes the relative energy of the flow field, however most of energy is related to only the very first few modes and corresponding eigenvalues.

The results show that 2D ROM models are more computationally efficient and can accurately reconstruct the flow field details. This method proves to have the ability to properly identify the flow characteristics, such as the recirculation flow pattern in the seal cavity.

Copyright © 2016 by ASME

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