Stability improvement of the ultra-high speed micro turbocharger supported by air foil bearings

Yong Suk Kwak, Chang Ho Kim, Jin Taek Chung, Yong Bok Lee

Research output: Contribution to journalArticle

Abstract

To improve the operational stability of the 100 Watts class Micro Gas Turbine, the air foil bearing with additional damping material has been investigated. The key of structure is that a viscoelastic material is coated under the top foil. The compliant foil journal bearing and thrust bearing are designed to withstand high load of vibrations at the operational speed 870,000 rpm. Test is executed in room temperature. Rotor has stably operated above 480,000 rpm. It is over 55% of the designed speed 870,000 rpm. Synchronous and subsynchronous vibrations are both well controlled. Vibration amplitude diminished over 50%. With the help of increased damping resulting from the viscoelasticity, the rotor stability of Micro turbocharger has been improved.

Original languageEnglish
Pages (from-to)541-548
Number of pages8
JournalTransactions of the Korean Society of Mechanical Engineers, A
Volume32
Issue number7
DOIs
Publication statusPublished - 2008 Jul

Keywords

  • Air foil bearing
  • Micro gas turbine engine
  • Rotor instability
  • Viscoelastic material

ASJC Scopus subject areas

  • Mechanical Engineering

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