Numerical Study on Bending Angle Optimization of Rod Bundle Channel Spacer Grid Mixing Vane Based on Subcooled Boiling CFD
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摘要: 定位格架是燃料组件的关键部件，不仅对燃料组件起到固定和支撑的作用，还影响着燃料组件的热工水力性能。本文采用基于欧拉-欧拉两流体六方程的伦斯勒理工学院（RPI）壁面沸腾模型，对5×5燃料棒束通道中出现过冷沸腾时的工况进行数值模拟研究，获得了棒束通道内的流场、中心棒束不同轴向高度处的周向壁面温度和空泡份额的分布情况。数值计算结果表明，棒束通道的压力损失随着搅混翼折弯角度的增大而增大；当搅混翼折弯角度为30°时，空泡份额相对较少，在定位格架的下游中心棒束温度峰值相对较低。Abstract: The spacer grid is a key component of the fuel assembly. It not only fixes and supports the fuel assembly, but also affects the thermal and hydraulic performance of the fuel assembly. In this paper, the Rensselaer Polytechnic Institute(RPI) wall boiling model based on the Euler-Euler six equations of two fluids is used to carry out a numerical simulation study on the working conditions when subcooled boiling occurs in the 5×5 fuel rod bundle channel; the flow field in the rod bundle channel, the distribution of circumferential wall temperature at different axial heights of the central rod bundle and the distribution of void are obtained. The numerical study results show that the pressure loss of the rod bundle channel increases with the increase of the bending angle of the mixing vane; when the bending angle of the mixing vane is 30°, the proportion of void is relatively small, and the peak temperature of the central rod bundle is relatively low in the downstream of the spacer grid.
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Key words:
- Rod bundle channel /
- Subcooled boiling /
- Numerical study /
- Spacer grid
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图 2 数值计算模型验证对比图
Figure 2. Comparison Diagram of Numerical Calculation Model Verification
图 7 截面平均空泡份额随轴向高度变化计算结果
Figure 7. Calculation Results of Average Void Fraction in Cross Section Changing with Axial Height
图 8 搅混翼折弯角度为30°时不同轴向高度处的空泡份额截面分布云图
Figure 8. Nephogram of Cross-sectional Distribution of Void at Different Axial Heights When the Bending Angle of the Mixing Vane is 30°
图 9 中心棒束壁面温度计算结果
Figure 9. Calculation Results of Wall Temperature of Central Rod Bundle
图 10 不同折弯角度下的棒束通道压降计算结果
Figure 10. Calculation Results of Pressure Drop in Rod Bundle Channels at Different Bending Angles
图 12 液相二次流在不同轴向高度处的截面分布云图
Figure 12. Nephogram of Cross-sectional Distribution of Secondary Flow at Different Axial Heights
表 1 计算域边界条件设置
Table 1. Calculation Domain Boundary Condition Settings
计算域边界 温度/℃ 速度/
(m·s−1)空泡
份额相对压
力/MPa系统压
力/MPa入口 气相 0 16.5 液相 343.2 1.505 出口 气相 0 液相 
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