Hydroinertia gas bearing for ultra-small gas turbine engine :Influence of operating temperature for characteristic of hydroinertia gas bearing

Kousuke Hikichi, Shinichi Togo, Masayoshi Esashi, Shuji Tanaka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This paper describes the design, installation and tests of an externally-pressurized gas bearing system for the demonstration of an ultra-small gas turbine engine. The bearing system supported an 8 mm diameter nickel alloy shaft with impellers at both ends. Each radial bearing is composed of two zirconia hemicylinders, allowing the balanced one-piece rotor to be assembled into the bearing system. In hot operation, difference in thermal expansion between the shaft and the bearings is critical, because it changes the bearing gaps out of die operational range. We estimated die thermal expansion of the shaft under engine operation by finite element method (FEM) simulation, and determined the bearing gap which is acceptable in both hot and cold operation. We also developed a real-time bearing monitoring system, and monitored the amplitude of rotor vibration, bearing air flow rates etc. to avoid any fatal touch between the rotor and the bearings. Finally, the cycle of the ultra-small gas turbine engine was established at 360, 000 rpm using the developed gas bearing system.

Original languageEnglish
Pages (from-to)292-299
Number of pages8
JournalToraibarojisuto/Journal of Japanese Society of Tribologists
Volume55
Issue number4
Publication statusPublished - 2010 Jun 14

Keywords

  • Gas bearing
  • Gas turbine
  • High speed rotation
  • Micro power source
  • Thermal expansion

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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