Publication result detail

Labyrinth seal design for space applications

POUZAR, J.; KOŠŤÁL, D.; WESTERBERG, L.; NYBERG, E.; KŘUPKA, I.

Original Title

Labyrinth seal design for space applications

English Title

Labyrinth seal design for space applications

Type

WoS Article

Original Abstract

Labyrinth seals, extensively used in space applications, serve to prevent the loss of liquid lubricants and shield satellite subsystems from contamination. These seals are essential for the reliable functioning of bearings and for protecting satellite subsystems from contamination. This study compares analytical predictions of lubricant loss against experimental measurements and computer simulations to optimize labyrinth seal configurations. Analytical models tend to overestimate mass loss by 5-8 times compared to experimental data, indicating limited reliability for complex seal geometries. Simulations using MolFlow+ and COMSOL Multiphysics align closely with experimental results, providing accurate mass loss predictions. Key findings highlight that labyrinth length, width, and surface roughness are critical factors in minimizing evaporative mass loss. Notably, stepped labyrinth seals with relief grooves and optimized step positioning effectively reduce molecular beaming effects and improve sealing performance compared to straight geometries. Effective sealing not only reduces mission failures but also helps to minimize space debris, thereby promoting safer satellite missions.

English abstract

Labyrinth seals, extensively used in space applications, serve to prevent the loss of liquid lubricants and shield satellite subsystems from contamination. These seals are essential for the reliable functioning of bearings and for protecting satellite subsystems from contamination. This study compares analytical predictions of lubricant loss against experimental measurements and computer simulations to optimize labyrinth seal configurations. Analytical models tend to overestimate mass loss by 5-8 times compared to experimental data, indicating limited reliability for complex seal geometries. Simulations using MolFlow+ and COMSOL Multiphysics align closely with experimental results, providing accurate mass loss predictions. Key findings highlight that labyrinth length, width, and surface roughness are critical factors in minimizing evaporative mass loss. Notably, stepped labyrinth seals with relief grooves and optimized step positioning effectively reduce molecular beaming effects and improve sealing performance compared to straight geometries. Effective sealing not only reduces mission failures but also helps to minimize space debris, thereby promoting safer satellite missions.

Keywords

Vacuum evaporation; Molecular flow; Labyrinth seals; Contamination; Liquid lubricants; Space tribology

Key words in English

Vacuum evaporation; Molecular flow; Labyrinth seals; Contamination; Liquid lubricants; Space tribology

Authors

POUZAR, J.; KOŠŤÁL, D.; WESTERBERG, L.; NYBERG, E.; KŘUPKA, I.

Released

14.02.2025

Publisher

Elsevier

Location

OXFORD

ISBN

0042-207X

Periodical

Vacuum

Volume

232

Number

2

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

10

Pages count

10

URL

https://www.sciencedirect.com/science/article/pii/S0042207X2400928X

Full text in the Digital Library

http://hdl.handle.net/11012/250091

BibTex

@article{BUT197164,
  author="Josef {Pouzar} and David {Košťál} and Lars-Göran {Westerberg} and Erik {Nyberg} and Ivan {Křupka}",
  title="Labyrinth seal design for space applications",
  journal="Vacuum",
  year="2025",
  volume="232",
  number="2",
  pages="1--10",
  doi="10.1016/j.vacuum.2024.113882",
  issn="0042-207X",
  url="https://www.sciencedirect.com/science/article/pii/S0042207X2400928X"
}

Documents

1-s2.0-S0042207X2400928X-main