A new rotating test facility for the experimental characterisation of shaft seals

E. Pedraza-Valle, J. A. Scobie, C. M. Sangan, P. S. Keogh, A. Bowsher, P. F. Crudgington

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

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Abstract

Turbomachinery shaft seals suffer from rubs caused by thermal growth, assembly misalignment and rotor dynamic vibration at engine start-up and shut-down. Rubs are detrimental to performance, leading to a decrease in overall efficiency and costly corrective maintenance. In recent years, compliant seals have been developed, allowing for variable clearances and a reduced frequency of seal rubs. The design goal for compliant seals is therefore, to maintain a tight clearance between rotating and non-rotating parts, throughout the transient conditions experienced in engines. This paper presents the design of a new high-speed rotating test facility developed for the performance characterisation of turbine shaft seals. The rig features a 254 mm diameter rotor, capable of rotating at speeds of up to 15,000 rpm (equivalent to rotor surface speeds up to 200 m/s). The maximum pressure difference across a seal is 3.5 bar. In the first experimental campaign, the performance of a labyrinth seal was investigated. The rotordynamic coefficients of the seal were calculated by exciting the casing with an electromagnetic shaker. The leakage performance, direct and cross-coupled seal stiffnesses and effective damping coefficients are determined.

Original languageEnglish
Title of host publication13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics (ETC), 2019
Publication statusPublished - 8 Apr 2019
Event13th European Turbomachinery Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2019 - Lausanne, Switzerland
Duration: 8 Apr 201912 Apr 2019

Conference

Conference13th European Turbomachinery Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2019
CountrySwitzerland
CityLausanne
Period8/04/1912/04/19

Keywords

  • Labyrinth seals
  • Rotordynamics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Pedraza-Valle, E., Scobie, J. A., Sangan, C. M., Keogh, P. S., Bowsher, A., & Crudgington, P. F. (2019). A new rotating test facility for the experimental characterisation of shaft seals. In 13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics (ETC), 2019