Numerical Study on Flow and Heat Transfer Characteristics of Subcooled Boiling in 5×5 Petal-shaped Fuel Rod Assembly
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摘要: 使用欧拉两流体模型和伦斯勒理工学院（RPI）壁面沸腾模型并考虑燃料棒组件内流固耦合传热，探究了5×5花瓣形燃料棒组件在均匀体积热源条件下的过冷沸腾流动与换热特性，分析了不同子通道内的速度场、温度场、空泡份额分布以及换热系数分布规律等。研究发现，棒束通道内二次流强度沿轴向呈周期性波动变化；过冷沸腾工况下花瓣形燃料组件内空泡份额峰值出现在靠近出口处，汽泡主要在燃料棒内凹弧处产生，呈逆时针偏心分布，且角子通道的汽相体积份额明显大于中心子通道；在本文模拟工况下，芯块最高温度达到657.9 K，沿轴向燃料棒芯块高温区面积逐渐增大，且角子通道的冷却剂温度高于边子通道，中心子通道冷却剂平均温度最低，各子通道的换热系数沿轴向呈周期性波动。Abstract: Based on the Eulerian two-fluid model and the Rensselaer Polytechnic Institute (RPI) wall boiling model, and considering the fluid-solid coupling heat transfer in fuel rod assembly, the flow and heat transfer characteristics of subcooled boiling in the 5×5 petal-shaped fuel rod assembly under the condition of uniform volume heat source was studied, and the velocity field, temperature field, void fraction distribution and heat transfer coefficient distribution in different sub-channels were analyzed. The results show that the secondary flow intensity in the rod bundle channel changes periodically along the axial direction. Under subcooled boiling condition, the peak value of void fraction in petal-shape fuel assembly appears near the outlet. The bubbles are mainly generated at the elbow of the fuel rod and distribute eccentrically counterclockwise, and the volume fraction of vapor in the corner subchannel is obviously larger than that in the center subchannel. Under the simulated conditions in this paper, the maximum temperature of the pellet reaches 657.9 K. The area of high temperature zone of the fuel rod pellet increases gradually along the axial direction, and the coolant temperature in the corner subchannel is higher than that of the edge subchannel. The average coolant temperature of the central subchannel is the lowest, and the heat transfer coefficient of each subchannel fluctuates periodically along the axial direction.
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图 2 棒束几何示意图
1、2、3——燃料棒编号
Figure 2. Geometric Structure of 5×5 Petal-shaped Fuel Rod Assembly
图 6 花瓣形燃料棒组件不同高度截面沿x方向横向速度分布
Figure 6. Transverse Velocity Distribution in x Direction on Sections with Different Heights of Petal Shaped Fuel Rod Assembly
图 8 花瓣形燃料棒组件不同高度截面空泡份额分布
Figure 8. Distribution of Void Fraction on Sections with Different Heights of Petal Shaped Fuel Rod Assembly
图 9 z/Lz=0.75截面不同子通道空泡份额周向分布
Figure 9. Circumferential Distribution of Void Fraction at Plane z/Lz=0.75 in Different Subchannels
图 10 花瓣形燃料棒组件在不同高度上包壳及燃料截面温度分布
Figure 10. Temperature Distribution of Cladding and fuel at Different Sections of Petal Shaped Fuel Rod Assembly
图 11 z/Lz=0.6875不同子通道包壳表面温度分布
Figure 11. Temperature Distribution of Cladding Surface at Plane z/L z =0.6875 in Different Subchannels
图 12 花瓣形燃料棒组件不同部件沿轴向温度分布及换热系数分布
Figure 12. Axial Temperature Distribution and Heat Transfer Coefficient Distribution of Different Parts of Petal Shaped Fuel Rod Assembly
表 1 网格参数
Table 1. Mesh Parameters
网格编号 轴向节点 Y+ 网格总数/万 1 250 120 1956.4 2 250 60 2856.7 3 250 12 3055.3 
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表 2 初始条件和边界条件
Table 2. Initial and Boundary Conditions
计算域 边界位置 边界类型 参数 流体域 进口 速度进口 速度：3.17 m/s 温度：570 K 空泡份额：0 出口 压力出口 压力：15.5 MPa 内壁面 耦合壁面 与包壳耦合 外壁面 壁面 绝热、无滑移 包壳 内壁面 耦合壁面 与燃料耦合 外壁面 耦合壁面 与流体域耦合 顶面、底面 壁面 绝热 燃料 外壁面 耦合壁面 与包壳耦合 顶面、底面 壁面 绝热 燃料固体域 体积热源 功率：2×108 W/m3
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