上海交通大学 核科学与工程学院， 上海 200240
出版日期:2020-01-28发布日期:2020-01-16通讯作者:龚圣捷，男，副教授，博士生导师，电话（Tel.）: 021-34206766;E-mail:gsj@sjtu.edu.cn.作者简介:张波涛（1994-），男，云南省大理市人，博士生，主要从事流致振动研究.Experimental and Numerical Simulation Study on Flow-Induced Vibration Characteristics of Flat Strip
ZHANG Botao，ZHU Yechen，MEI Yong，GONG ShengjieSchool of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Online:2020-01-28Published:2020-01-16摘要/Abstract
摘要： 核反应堆内燃料组件受到高流速冷却剂的冲刷会产生流致振动现象，而燃料棒包壳和格架条带的振动将会导致燃料组件受到磨损，从而影响核电厂运行的安全性.为了研究格架条带流致振动的特性及分析方法，采用不带结构的不锈钢平直条带进行流致振动实验，并使用激光多普勒测振仪测量其在水流动条件下的振动特性.实验结果表明：当涡激振动频率在接近固有频率时会发生“锁定”现象；在特定流速区间内，涡激振动频率与流速呈线性关系；通过湿模态模拟方法可以较好地预测平直条带在水中的固有频率.
关键词: 平直条带； 流致振动； 涡激振动； 湿模态
Abstract: Flow-induced vibration will happen when the fuel assemblies in a reactor are flushed by the coolant at a high speed. And vibration of fuel rod cladding and spacer grid strips will lead to wear of fuel assemblies, which affects the operation security of nuclear power plant. In order to study the characteristics and the methods of flow-induced vibration of spacer grid strips, a flat stainless strip without structure is employed to carry on the flow-induced vibration experiments. A laser Doppler vibrometer is used to measure the vibration characteristics of the strip under waterflow conditions. The test results show that the “lock-in” phenomenon occurs when the frequency of vortex-induced vibration is near to the natural frequency. Vortex-induced vibration frequency is linear with the flow velocity within a certain flow rate range. Furthermore, the natural frequency of the flat strip in water is well predicted by applying wet modal simulation.
Key words: flat strip; flow-induced vibration; vortex-induced vibration; wet modal
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