The Panel Method for Rigid Section Group Added Mass Coefficients and Its Application to Fuel Assemblies
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摘要:
基于面元法发展了适用于计算具有任意复杂外形的刚性截面族附加流体质量系数的数值方法，并将其应用到压水堆燃料组件的计算中，分析了1 × 5组件抗震试验中由组件位置偏差所引起的附加质量系数变化规律。结果表明：该方法能解决具有复杂连续边界的刚性截面族附加质量系数计算问题；相较于组件间间隙，围板与组件间隙对质量系数的影响占主导；无论存在何种位置偏差，任意一组件在所有组件和围板上产生的沿假设运动方向与垂直假设运动方向上的附加质量系数之和分别近似为−1和0。
Abstract:A numerical method based on the panel method was developed to calculate the added fluid mass coefficients of the rigid section group with arbitrarily complex shapes, and was successfully applied to the PWR fuel assemblies. The variation law of added mass coefficients with position deviations was analyzed in the seismic test of 1×5 fuel assemblies. The results show that, this method is suitable for the calculation of the added mass coefficients of rigid section groups with complex continuous boundaries. Compared with the gap between assemblies, the gap between baffles and assemblies has a dominant influence on the added mass coefficient. Regardless of the position deviation, the sum of the added mass coefficients of all assemblies and baffles in the assumed motion direction is approximately equal to –1, and that in the perpendicular direction is approximately equal to 0.
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Key words:
- rigid section group /
- added mass /
- panel method /
- fuel assemblies /
- position deviation
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图 1 二维模型示意图：(a)容器截面图； (b)面元法离散图；(c)相对坐标图
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同。
Figure 1. Schematic diagram of the 2D model: (a) the sectional view of the container; (b) the discrete graph of the panel element method; (c) the relative coordinate graph
图 2 封闭圆形容器内的一组圆形截面
Figure 2. A group of circular sections inside a closed circular container
图 5 单根燃料组件示意图：(a)单根燃料组件模型；(b) ANSYS流场网格
Figure 5. Schematic diagram of a single fuel assembly: (a) the single fuel assembly model; (b) the ANSYS flow field mesh
图 6 本文结果与ANSYS结果对比图
Figure 6. The comparison between the results of this method and the ANSYS results
表 1 截面质量系数之和
Table 1. Sums of mass coefficients of sections
p $\displaystyle \sum\limits_q {m_{pq}^x }$ $\displaystyle \sum\limits_q {m_{pq}^y }$ 3 4 6 3 4 6 ref. [6] −0.9998 −0.9997 −0.9997 −0.0001 0 0 present −1.0001 −1.0001 −1.0001 0 0 0 
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