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Self-Induced Oscillations of Free Surface in an upper plenum of FBR

FBR 上静压室中自由表面的自激振荡

基本信息

批准号：
03452299
负责人：
MADARAME Haruki
金额：
$ 2.56万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452299/
关键词：
Flow Induced Vibration Self-Induced Oscillation Sloshing Liquid Column Oscillation Fast Breeder Reactor Upper Plenum Free Surface Jet

项目摘要

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.

已经发现了以下四种类型的液体表面的自诱导振荡。阐明了这些现象的特征，并对振荡的供能机制进行了讨论。1.在一个薄的矩形贮箱中观察到一种自感晃动。晃动的产生需要表面下的强循环流，其中心偏向环流的向上流动侧。振荡能量被认为是由循环流和晃动之间的相互作用引起的压力波动提供的。2.在通过短管道与下游较大水箱连接的水箱中观察到了自激水位振荡。在上游槽中有两种流动模式：要么大部分进口流动动能被吸入连接管道，要么很少。3.当矩形槽中的水被向上冲击自由表面的平面射流分开时，射流两侧的水面以与具有相同深度的U形管中的水柱相同的频率振荡。它发生在撞击点两侧的表面速度超过波速，从而水位扰动不能被表面附近的流动恢复时。4.在对称轴上有向上射流冲击自由表面的贮箱中，观察到了自激晃动。水从主断面两侧的底流闸门流出，流向子断面。在主段晃动增长过程中，子段内液面振荡的耦合作用起着重要的作用。