Abstract
A microbearing tester driven by an air turbine of 10 mm diameter has been developed, and successfully used to test hydroinertia gas bearings with a shaft of 4 mm diameter. The effects of bearing gas pressure conditions and bearing length to diameter ratio (L/D) on the maximum achievable rotation speed were investigated. The maximum rotation speed of 890,000 rpm, which corresponds to the DN number (the product of a shaft diameter in millimeter and a rotation speed in rpm) of 3,560,000, was achieved. At 890,000 rpm, the tip speed of the turbine reaches approximately 470 m/s. Using the bearing system developed, the turbo components of a 100 W class gas turbine and an air pump for 1 kW class fuel cells can be tested.
Original language | English |
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Pages (from-to) | 655-659 |
Number of pages | 5 |
Journal | Journal of Tribology |
Volume | 129 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2007 Jul 1 |
Keywords
- High-speed bearing
- Hydroinertia gas bearing
- Microturbomachinery
- Turbine
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Surfaces and Interfaces
- Surfaces, Coatings and Films