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Yokohama National University Repository >
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5-1 学術雑誌論文 >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10131/3728
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| Title: | Performance Improvement and Peculiar Behavior of Disk Friction and Leakage in Very Low Specific-Speed Pumps |
| Author: | Kurokawa, Junichi
Matsumoto, Kazunari
Matsui, Jun
Imamura, Hiroshi |
| Affiliation: | Dept. of Mechanical Engrg., Yokohama National University, Yokohama, Japan
Dept. of Mechanical Engrg., Yokohama National University, Yokohama, Japan
Dept. of Mechanical Engrg., Yokohama National University, Yokohama, Japan
Dept. of Mechanical Engrg., Yokohama National University, Yokohama, Japan |
| Issue Date: | 2000 |
| Publisher: | International Association of Hydraulic Research (IAHR) |
| Abstract: | Pump efficiency drops rapidly with a decrease in the specific speed n, in the very low ns range. The cause for low efficiency of a very low specific speed pump is mainly due to large disk friction. The present authors propose two methods of reducing disk friction, both of which are very unusual in pump design, but they are confirmed experimentally to be very effective for efficiency improvement. One method is to increase the amount of leakage, which resulted in a rapid decrease of disk friction and raised the pump efficiency by about 7%. The other is to increase the surface roughness of impeller shroud, which raised the pump efficiency by about 3%. |
| URI: | http://hdl.handle.net/10131/3728 |
| Type: | Conference Paper |
| Language: | eng |
| Journal Title: | Proceedings of 20th IAHR Symposium on Hydraulic Machinery and Systems, August 6th - 9th 2000, Charlotte, USA |
| Version: | publisher |
| Appears in Collections: | 5-1 学術雑誌論文
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| B-112.pdf | | 731Kb | Adobe PDF | View/Open |
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