Theoretical analysis of bump-floating-ring seals

Yong Bok Lee, Kyung Wok Kim, Chang Ho Kim, Jin Taek Chung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper describes modelling and analysis of bump floating ring seal with the bump effect and the fluid dynamic effect of floating ring seal. A numerical analysis method is developed and implemented for predicting the BFRSs' lock-up eccentricity ratio, leakage flow-rate, rotordynamic force coefficients and attitude-angle. Also, the comparison of the BFRSs' properties with those of the conventional FRSs, having common geometric parameters and operating conditions, is performed. A turbulent bulk-flow model is used to predict the flow and rotordynamic parameters. From the analytical results, the lock-up eccentricity reduces by 50% FRSs, the BFRSs' direct stiffness and damping coefficients are higher, and cross-coupled terms are less responsive to changing rotor-speed. Although, the lock-up eccentricity is smaller, the sealing effectiveness remains unchanged. The predictions are reasonably in good agreement with test data, except the attitude-angles are over-predicted.

Original languageEnglish
Title of host publication2015 IFToMM World Congress Proceedings, IFToMM 2015
PublisherNational Taiwan University
ISBN (Electronic)9789860460988
DOIs
Publication statusPublished - 2015
Event14th International Federation for the Promotion of Mechanism and Machine Science World Congress, IFToMM 2015 - Taipei, Taiwan, Province of China
Duration: 2015 Oct 252015 Oct 30

Other

Other14th International Federation for the Promotion of Mechanism and Machine Science World Congress, IFToMM 2015
CountryTaiwan, Province of China
CityTaipei
Period15/10/2515/10/30

Fingerprint

Seals
Fluid dynamics
Numerical analysis
Rotors
Damping
Stiffness
Flow rate
Eccentricity
Ring
Seal
Sealing
Modeling
Conventional
Prediction
Numerical Analysis
Bulk

Keywords

  • Bump floating-ring seal
  • Eccentricity ratio
  • Leakage
  • Rotordynamic coefficients
  • Turbo-pump

ASJC Scopus subject areas

  • Mechanical Engineering
  • History

Cite this

Lee, Y. B., Kim, K. W., Kim, C. H., & Chung, J. T. (2015). Theoretical analysis of bump-floating-ring seals. In 2015 IFToMM World Congress Proceedings, IFToMM 2015 National Taiwan University. https://doi.org/10.6567/IFToMM.14TH.WC.OS18.015

Theoretical analysis of bump-floating-ring seals. / Lee, Yong Bok; Kim, Kyung Wok; Kim, Chang Ho; Chung, Jin Taek.

2015 IFToMM World Congress Proceedings, IFToMM 2015. National Taiwan University, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, YB, Kim, KW, Kim, CH & Chung, JT 2015, Theoretical analysis of bump-floating-ring seals. in 2015 IFToMM World Congress Proceedings, IFToMM 2015. National Taiwan University, 14th International Federation for the Promotion of Mechanism and Machine Science World Congress, IFToMM 2015, Taipei, Taiwan, Province of China, 15/10/25. https://doi.org/10.6567/IFToMM.14TH.WC.OS18.015
Lee YB, Kim KW, Kim CH, Chung JT. Theoretical analysis of bump-floating-ring seals. In 2015 IFToMM World Congress Proceedings, IFToMM 2015. National Taiwan University. 2015 https://doi.org/10.6567/IFToMM.14TH.WC.OS18.015
Lee, Yong Bok ; Kim, Kyung Wok ; Kim, Chang Ho ; Chung, Jin Taek. / Theoretical analysis of bump-floating-ring seals. 2015 IFToMM World Congress Proceedings, IFToMM 2015. National Taiwan University, 2015.
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N2 - This paper describes modelling and analysis of bump floating ring seal with the bump effect and the fluid dynamic effect of floating ring seal. A numerical analysis method is developed and implemented for predicting the BFRSs' lock-up eccentricity ratio, leakage flow-rate, rotordynamic force coefficients and attitude-angle. Also, the comparison of the BFRSs' properties with those of the conventional FRSs, having common geometric parameters and operating conditions, is performed. A turbulent bulk-flow model is used to predict the flow and rotordynamic parameters. From the analytical results, the lock-up eccentricity reduces by 50% FRSs, the BFRSs' direct stiffness and damping coefficients are higher, and cross-coupled terms are less responsive to changing rotor-speed. Although, the lock-up eccentricity is smaller, the sealing effectiveness remains unchanged. The predictions are reasonably in good agreement with test data, except the attitude-angles are over-predicted.

AB - This paper describes modelling and analysis of bump floating ring seal with the bump effect and the fluid dynamic effect of floating ring seal. A numerical analysis method is developed and implemented for predicting the BFRSs' lock-up eccentricity ratio, leakage flow-rate, rotordynamic force coefficients and attitude-angle. Also, the comparison of the BFRSs' properties with those of the conventional FRSs, having common geometric parameters and operating conditions, is performed. A turbulent bulk-flow model is used to predict the flow and rotordynamic parameters. From the analytical results, the lock-up eccentricity reduces by 50% FRSs, the BFRSs' direct stiffness and damping coefficients are higher, and cross-coupled terms are less responsive to changing rotor-speed. Although, the lock-up eccentricity is smaller, the sealing effectiveness remains unchanged. The predictions are reasonably in good agreement with test data, except the attitude-angles are over-predicted.

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