Hydroinertia gas bearing system to achieve 470 m/s tip speed of 10 mm-diameter impellers

Shuji Tanaka; Masayoshi Esashi; Kousuke Isomura; Kousuke Hikichi; Yuki Endo; Shinichi Togo

doi:10.1115/1.2736707

Hydroinertia gas bearing system to achieve 470 m/s tip speed of 10 mm-diameter impellers

Shuji Tanaka, Masayoshi Esashi, Kousuke Isomura, Kousuke Hikichi, Yuki Endo, Shinichi Togo

Research output: Contribution to journal › Article

9 Citations (Scopus)

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
Pages (from-to)	655-659
Number of pages	5
Journal	Journal of Tribology
Volume	129
Issue number	3
DOIs	https://doi.org/10.1115/1.2736707
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

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10.1115/1.2736707

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Tanaka, S., Esashi, M., Isomura, K., Hikichi, K., Endo, Y., & Togo, S. (2007). Hydroinertia gas bearing system to achieve 470 m/s tip speed of 10 mm-diameter impellers. Journal of Tribology, 129(3), 655-659. https://doi.org/10.1115/1.2736707

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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.",

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AU - Tanaka, Shuji

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AU - Endo, Yuki

AU - Togo, Shinichi

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