Numerical Study on Typical Cell of Fuel Assembly by Turbulence Excitation
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摘要: 为掌握全长范围内的燃料棒振动响应特性，以用于燃料棒微动磨损寿命分析，本研究运用计算流体动力学（CFD）方法，对燃料组件典型栅元的湍流激振进行数值模拟分析，并通过棒表面的瞬态脉动压力分布开展不同夹持力下的单棒瞬态动力学分析。研究表明：格架上游的截面平均湍动能约为0.1 m2/s2，格架临近出口位置湍动能达到峰值的0.65 m2/s2，格架的存在显著增强了流场的湍流强度，这是造成燃料棒湍流激振的主要原因；通过瞬态动力学分析确定了均方根振幅最大的定位格架位置，并建立了该格架的均方根振幅和振动速度随夹持力变化的关联式。本研究将为后续微动磨损理论计算及实验验证奠定基础。
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关键词:
- 燃料组件 /
- 典型栅元 /
- 湍流激振 /
- 流固耦合 /
- 计算流体动力学（CFD）
Abstract: In order to master the vibration response characteristics of fuel rods in the full length range for fretting wear life analysis of fuel rods, this study is to use the computational fluid dynamics (CFD) method to numerically simulate the turbulence excitation of typical lattice of fuel assembly, and to carry out the transient dynamic analysis of a single rod under different clamping forces through the transient fluctuating pressure distribution on the surface of fuel rod. The results show that: the average turbulent kinetic energy of the upstream section of the grid is about 0.1 m2/s2, and the turbulent kinetic energy peaks at 0.65 m2/s2 near the grid outlet. Therefore, the existence of grid significantly enhances the turbulence intensity of the flow field, which is the main reason for the turbulence excitation of the fuel rod; the position of the spacer grid with the maximum root mean square amplitude is determined by transient dynamic analysis, and the correlation between the root mean square amplitude and vibration velocity of the grid with the clamping force is established. This study will lay a foundation for the following theoretical calculation and experimental verification of fretting wear. -
图 2 流体域中不同网格的轴向截面平均压力变化
Figure 2. Mean Pressure Variation of Axial Section of Different Grids in Fluid Domain
图 7 格架区域截面平均湍动能变化
Figure 7. Variation of Mean Turbulent Kinetic Energy in Section of Grid Area
图 11 5#定位格架位置振幅时域信息
Figure 11. Time Domain Information of Position Amplitude of 5# Grid Spacer
图 13 不同夹持力下不同定位格架的均方根振幅
Figure 13. RMS Amplitude of Different Grid Spacers under Different Clamping Forces
图 14 不同夹持力下不同定位格架的时均振动速度
Figure 14. Time-Averaged Vibration Velocity of Different Grid Spacers under Different Clamping Forces
表 1 固体材料物性
Table 1. Solid Material Properties
材料 物性参数 数值 Zr-4 密度/(kg ∙ m−3) 6545.0 杨氏模量/GPa 78.45 泊松比 0.412 UO2 密度/(kg ∙ m−3) 10270.85 杨氏模量/GPa 2.446 泊松比 0.318 不锈钢 密度/(kg ∙ m−3) 7928.96 杨氏模量/GPa 172.0 泊松比 0.275 弹簧片 刚度/(N ∙ mm−1) 14334.0 刚凸 刚度/(N ∙ m−1) 381.0 
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表 2 瞬态计算参数设置
Table 2. Transient Calculation Parameter Setting
参数名 设置值 瞬态总时间/s 0.5 时间步长/s 0.001 单时间步长最大迭代次数 50
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