We have developed a water lubricated journal bearing for water vapor turbo compressor. Utilizing working fluid as liquid lubricant has advantages on high efficiency and structural simplicity of oil-free system. But the evaporation of lubricant effects on various kinds of dynamic properties which must be considered during the development of turbo compressors. The loss, stability, and heat transfer of water lubricated bearings, and the effects of cavitation were studied. When the sub-cool of lubricant water is small, vaporous cavitation is likely to appear. Vaporous cavitation is essentially different from gaseous cavitation of general oil-lubricated bearings in that the evaporation of lubricant occurs which involves latent heat. Because the vaporous cavitation reduces the viscosity loss, and the bearing is cooled not only by sensible heat but also by latent heat, the bearing temperature elevation is suppressed. Another effect of cavitation is stabilization of half speed whirl. We conducted two experiments. Firstly, a sub-scale bearing experiment which consists of 2 conical journal bearings, to investigate the above effects quantitatively and develop a prediction method. Secondly, a full-scale bearing experiment to demonstrate the bearings. As a result, we could drive a 28kg rotor at 31,000rpm stably and efficiently with water lubricated journal bearings.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4984-2
PROCEEDINGS PAPER
Saturated Water Journal Bearings of a Turbo Compressor Available to Purchase
Tadayoshi Shoyama,
Tadayoshi Shoyama
Panasonic Corporation, Moriguchi, Japan
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Kazuyuki Kouda,
Kazuyuki Kouda
Panasonic Corporation, Moriguchi, Japan
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Takeshi Ogata
Takeshi Ogata
Panasonic Corporation, Moriguchi, Japan
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Tadayoshi Shoyama
Panasonic Corporation, Moriguchi, Japan
Kazuyuki Kouda
Panasonic Corporation, Moriguchi, Japan
Takeshi Ogata
Panasonic Corporation, Moriguchi, Japan
Paper No:
GT2016-58131, V07BT31A038; 10 pages
Published Online:
September 20, 2016
Citation
Shoyama, T, Kouda, K, & Ogata, T. "Saturated Water Journal Bearings of a Turbo Compressor." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 7B: Structures and Dynamics. Seoul, South Korea. June 13–17, 2016. V07BT31A038. ASME. https://doi.org/10.1115/GT2016-58131
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