2001 Fiscal Year Final Research Report Summary
Study of Pump Abnormal Characteristics from Prevention toward Suppression and Control
| Project/Area Number |
11555055
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Fluid engineering
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| Research Institution | KYUSHU INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
TSUKAMOTO Hiroshi KYUSHU INSTITUTE OF TECHNOLOGY, ENGINEERING, PROFESSOR, 大学院・生命体工学研究科, 教授 (50117305)
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| Co-Investigator(Kenkyū-buntansha) |
TSUJIMOTO Yoshinobu OSAKA UNIVERSITY, ENGINEERING, PROFESSOR, 大学院・基礎工学研究科, 教授 (50112024)
KUROKAWA Junichi YOKOHAMA NATIONAL UNIVERSITY, ENGINEERING, PROFESSOR, 大学院・工学研究院, 教授 (40017976)
FURUKAWA Akinori KYUSHU UNIVERSITY, ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (30112410)
KIKUYAMA Koji NAGOYA UNIVERSITY, ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (90023192)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Pump / Unsteady Flow / Unstable Characteristics / Cavitation / Pressure Fluctuations / Viscous Flow Analysis / CFD / Unsteady Hydraulic Force |
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| Research Abstract |
A variety of unstable characteristics of turbopumps were studied to develop the flow control methods for the stable pump operations. Common factor was tried to find for-various unstable phenomena through the study of five different type unsteady phenomena in turbopumps.
[Osaka University Group]: Four bladed inducer was studied on inlet distortion, and then unsteady stress on blades was found to be induced by the interaction between cavities induced by inlet distortion and alternative blade cavitations. And three bladed inducer was found to generate the higher order rotating cavitations.
[Nagoya University Group]: Two different specific speed mixed flow pumps were tested to study the decrease in pumping action at low suction pressure. Flow distributions at pump impeller inlet are related to cavitations number.
[Kyushu University Group] : Tandem type rotating cascade as well as high blade outlet angle was tested to suppress and control the air lock phenomena at high void ratio. And control system for the blade outlet angle was tested to get the higher pump efficiency.
[Kyushu Institute of Technology Group]: Unsteady flow structures were studied to get the pre-unstable signals for the prediction of the occurrence of unstable phenomena of diffuser pump at low discharge.
[Yokohama National University Group]: Slit on diffuser wail, the J-Groove, was tested to suppress the rotating vortex core at strong inlet distortion in conical diffuser.
The J-Groove was found to be effective for the suppression of pressure fluctuations due to strong rotating flow up to 46 percent.
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[Publications] Yoshida, Y., Tsujimoto, Y., Kataoka, D., Horiguchi, H., and F. Wahl: "Effects of Alternate Leading Edge Cutback on Unsteady Cavitation in 4-Bladed Inducers"ASME, Journal of Fluids Engineering. Vol.123,No.4. 762-770 (2001)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Fujii, A., Azuma, S., Yoshida, Y., Tsujimoto, Y., and Laffite, S.: "Unsteady Stress of 4-Bladed Inducer Blades and the Effect of Inlet Flow Distortion"JSME International Journal. Vol.45,No.1. 47-54 (2002)
Description
「研究成果報告書概要(欧文)」より
