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

Keywords

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

ASJC Scopus subject areas

  • Mechanical Engineering
  • History

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