Small scale experiments of sloshing considering the seismic safety of MYRRHA
Small scale experiments of sloshing considering the seismic safety of MYRRHA
复制标题
DOI：
10.1016/j.ijhydene.2016.01.158
复制
发表时间：
2016-05
影响因子：
7.2
通讯作者：
K. Myrillas;P. Planquart;J. Buchlin;M. Schyns
中科院分区：
文献类型：
--
作者：
K. Myrillas;P. Planquart;J. Buchlin;M. Schyns
晃动可能是重液态金属冷却核反应堆地震安全性的一个非常令人担忧的问题，例如比利时核研究中心(SCK·CEN)目前正在开发的第四代原型没药。在冯·卡曼研究所的莎士比亚振动台设施上进行了缩小规模的实验室实验，研究了晃动问题。通过量纲分析讨论了实验模型的尺度，确定了合适的尺度因子，并将其应用于地震激励信号。模型内液体晃动的定性结果是通过流动显示获得的，而力矩是在部分浸入液体中的仪表杆上测量的。构造了一个双分量力矩天平，用于测量单元沿水平轴的弯矩。结果表明，晃动作为一种非线性现象，高度依赖于特定容器中液体相对于其固有频率的作用力频率。在共振情况下，晃动响应达到最大幅度并测量最大力矩，这代表了反应堆安全的最坏情况。晃动模型中内部部件的试验表明，障碍物减少了晃动载荷，防止了共振型晃动。该方法为没药的设计和安全性分析提供了一种有效的工具。
Sloshing can be a great concern for the seismic safety of heavy liquid metal cooled nuclear reactors, such as the Gen IV prototype MYRRHA, currently under development by the Belgian Nuclear Research Center (SCK•CEN). Sloshing is studied using reduced scale laboratory experiments on the SHAKESPEARE shaking table facility of the von Karman Institute. Scaling of the experimental model is discussed through dimensional analysis, identifying the appropriate scaling factors which are then applied to the seismic excitation signals. Qualitative results of the liquid sloshing motions inside the model are obtained with flow visualization, while moments are measured on an instrumented rod that is partially immersed in the liquid. A two component moment-balance is constructed to measure the bending moments on the element about the horizontal axes. The results demonstrate that sloshing, as a non-linear phenomenon, is highly dependent on the frequency of forcing relative to the natural frequency of the liquid in the specific container. In the resonance case the sloshing response reaches the highest amplitude and maximum moments are measured, representing a worst case scenario for the reactor safety. Experiments with internal components in the sloshing model indicate that obstructions reduce the sloshing loads and prevent resonance type sloshing. The proposed methodology with small scale experiments can provide a useful tool for the prediction of the sloshing effects for the MYRRHA design and safety analysis.