1992 Fiscal Year Final Research Report Summary
Self-Induced Oscillations of Free Surface in an upper plenum of FBR
| Project/Area Number |
03452299
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MADARAME Haruki Univ. Tokyo, Dept. Engrg., Professor, 工学部, 教授 (80092336)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Koji Univ. Tokyo, Dept. Engrg., Associate Professor, 工学部, 助教授 (80204030)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Flow Induced Vibration / Self-Induced Oscillation / Sloshing / Liquid Column Oscillation / Fast Breeder Reactor / Upper Plenum / Free Surface / Jet |
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| Research Abstract |
The following four types of self-induced oscillations of liquid surfaces have been discovered. The characteristics of the phenomena have been clarified and the energy supply mechanisms to the oscillations have been discussed. 1. A self-induced sloshing was observed in a thin rectangular tank. The sloshing generation required strong circulating flow under the surface whose center was biased toward the upward flow side of the circulation. The oscillation energy was considered to be supplied by pressure fluctuations caused by the interaction between the circulating flow and the sloshing. 2. A self-induced water level oscillation was observed in a tank connected with a larger downstream tank by a short duct. There were two flow patterns in the upstream tank; either most of the inlet flow kinetic energy or little was sucked into the connecting duct. 3. When water in a rectangular tank was divided by an upward plane jet impinging on the free surface, the water surfaces on the both sides of the jet oscillated with the same frequency as a water column in a U-shaped tube having the same depth. It occurred when the surface velocity on the both sides of the impinging point exceeded the wave velocity so that water level disturbance could not recovered by a flow near the surface. 4. A self-induced sloshing was observed in a tank having an upward jet on the axis of symmetry impinging on the free surface. Water flowed out through underflow gates on the both sides of the main section to sub-sections. A coupled effect with the level oscillation in the sub-section was considered to play an important role in the sloshing growth in the main section.
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Research Products
(16 results)
