格架夹持失效对燃料棒流弹稳定性及漩涡脱落影响的数值研究  

Numerical Study on Effect of Clamping Failure on Flow Induced Vibration and Fretting Wear Analysis of Fuel Rods

作　　者：齐欢欢[1] 冯志鹏[1] 姜乃斌[1] 黄茜[1] 吴万军[1] 黄旋[1] 江小州 Qi Huanhuan;Feng Zhipeng;Jiang Naibin;Huang Qian;Wu Wanjun;Huang Xuan;Jiang Xiaozhou(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2018年第4期182-186,共5页Nuclear Power Engineering

基　　金：国家自然科学基金资助项目(51606180)

摘　　要：流弹稳定性和漩涡脱落是流致振动分析的两个重要机理。由于制造工艺、运输、辐照影响,格架对燃料棒的夹持作用可能失效。以I、II型燃料组件为例,研究了夹持失效对燃料棒固有频率和振型、流弹稳定性以及漩涡脱落的影响。结果表明:刚凸支承失效对固有频率的影响与振型有直接关系,原振幅较大的位置附近刚凸支承失效对固有频率的影响明显。刚凸支承失效对两种型号燃料棒固有频率的影响类似。对于I型组件,燃料棒顶部和底部的流速较大,大小相当,顶部和底部格架的刚凸支承失效对流弹稳定性及漩涡脱落比值有较大影响。对于II型组件,顶部格架刚凸支承失效对流弹稳定性及漩涡脱落比值的影响明显。Flow elastic stability and vortex shedding were two important mechanisms for the flow induced vibration analysis. Due to the effects of manufacturing process, transportation and irradiation, the clamping action of grid on fuel rods may be invalid. Taking Type I and II fuel assemblies as an example, the effects of clamping failure on the natural frequencies, mode shapes, flow elastic stability and vortex shedding were studied. The results show that the effect of the dimple support failure on the natural frequency was directly related to the mode shape. The effect of the grid dimple failure near the original amplitude on the natural frequency was obvious. The effect of dimple failure on the natural frequency of two fuel rods was similar. For Type I, the velocity of flow at the top and bottom of the fuel rods were larger and the size was comparable. The dimple failure of the top and bottom grids had a significant effect on the stability of flow elastic and the vortex shedding ratio. For Type II fuel assembly, the dimple failure of the top grids had a more significant effect on the stability of flow elastic and the vortex shedding ratio comparing to the bottom grid failure.

关 键 词：燃料棒 夹持失效 流弹稳定性 漩涡脱落 

分 类 号：TL352[核科学技术—核技术及应用]