Analysis of Self-excited Sloshing Caused by the Fluid Discharge over the Flexible Weir Including Nonlinearity

含非线性柔性堰排液引起的自激晃动分析

基本信息

批准号：
07650275
负责人：
KANEKO Shigehiko
金额：
$ 1.47万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650275/
关键词：
Flow Induced Vibration Sloshing Self-excited Vibration Non-linear Vibration Stability Overflow Shell Vibration Fast Breeder Reactor シェル

项目摘要

Two rypes of self-excited vibrations of a cylindrical shell caused by the fluid discharge over the flexible weir were observed in French demonstration fast breeder reactor, Super Phoenix-1 during test operations. The first type is a sloshing coupled vibration and the latter is so called a fluidelastic vibration.In this study, an analytical model for the sloshing coupled vibration as observed in Super-Phoenix-ILMFBR is proposed. This fluid-structure system is constituted by the flexible weir and adjoining fluid plenums and the fluid is discharged from the upstream plenum to the downstream plenum over the flexible weir. The characteristic equation of the system is derived for the case in which the weir vibrates at the frequency of the downstream sloshing.In this research project, special attentions were made with higher mode sloshing coupled vibrations with the case of a rectangular flexible plate and with the case of two flexible cylindrical weirs. The effects of the fluid level difference between the upstream and the downstream plenum and weir rigidity are examined both theoretically and experimentally and the mechanism for instability is discussed in detail. As a result, it was found that the effects of discharge flow rate and the liquid height difference between the upper and lower tank on the higher mode instability can also be described by the proposed analytical model.

在法国示范快速育种反应堆中观察到了由柔性堰上的流体排放引起的圆柱形壳的两种自激发振动的RYP，在测试操作期间，Super Phoenix-1。第一种类型是摇摆的耦合振动，后者被称为流体弹性振动。在这项研究中，提出了在Super-Phoenix-Ilmfbr中观察到的晃动耦合振动的分析模型。该流体结构系统由柔性堰和毗邻的流体元素构成，流体从上游元素到下游膨胀的静脉内排放到柔性堰上。该系统的特征方程是针对堰处以下游斜率振动振动的情况。在该研究项目中，特殊注意事项是通过矩形柔性板和两个柔性cylindrical weirs的情况进行的，具有更高模式的倾斜耦合振动。在理论上和实验中检查了上游和下游元素和堰型刚度之间的流体水平差异的影响，并详细讨论了不稳定性的机制。结果，发现排放流量的影响以及上水箱之间的液体高度差在较高模式不稳定性上也可以通过提议的分析模型来描述。