Numerical Analysis of Influence of Positioning and Wrapping Wire Structure on Thermohydraulic Characteristics of Rod Bundle Channel
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摘要: 定位绕丝设计广泛应用于金属快堆堆芯设计及气冷快堆堆芯设计中，本文基于三维精细化绕丝定位棒束通道网格模型模拟分析了定位绕丝螺距、定位绕丝数量及定位绕丝形状对超临界二氧化碳在棒束通道中流动换热的影响。模拟结果表明定位绕丝螺距比定位绕丝数量及定位绕丝形状对温场流场的影响更大，定位绕丝螺距小于200 mm时，进出口压降大幅增加，表面换热系数增加，温度不均匀度大幅降低；随着定位绕丝数量增加，进出口压降线性增加，表面换热系数变化不大；圆形定位绕丝可以以较小截面积达到与方形定位绕丝相似的效果，梯形定位绕丝对流场影响不如矩形定位绕丝。Abstract: The positioning and wrapping wire design is widely applied in the core design of metal cooled fast reactor and gas cooled fast reactor. In this paper, the effects of pitch, number and shape of positioning and wrapping wires on the flow and heat transfer of supercritical carbon dioxide in rod bundle channel are simulated and analyzed based on three-dimensional fine mesh model of wrapping wire positioning rod bundle channel. The simulation results show that positioning and wrapping wire pitch has a greater influence on the temperature field and flow field than the positioning and wrapping wire number and shape. When the positioning and wrapping wire pitch is less than 200 mm, pressure drop at the inlet and outlet increases significantly, surface heat transfer coefficient increases, and temperature non-uniformity decreases significantly and the temperature unevenness decreases greatly; with the increase in the number of the positioning and wrapping wires, pressure drop at the inlet and outlet increases linearly, but the surface heat transfer coefficient changes little; circular positioning and wrapping wire can achieve a similar effect to that of rectangular positioning and wrapping wire with a smaller cross-sectional area, and trapezoidal positioning and wrapping wire has less influence on flow field than rectangular positioning and wrapping wire.
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图 5 定位绕丝螺距对绕丝定位棒束通道进出口压降的影响
Figure 5. Influence of Positioning and Wrapping Wire Pitch on Pressure Drop at the Inlet and Outlet of Wrapping Wire Positioning Rod Bundle Channel
图 6 定位绕丝螺距对绕丝定位棒束通道表面换热系数的影响
h—表面换热系数
Figure 6. Influence of Wrapping Wire Pitch on Surface Heat Transfer Coefficient of Wrapping Wire Positioning Rod Bundle Channel
图 7 定位绕丝螺距对截面温度不均匀度的影响
Figure 7. Influence of Positioning and Wrapping Wire Pitch on Cross Section Temperature Unevenness
图 8 绕丝定位燃料棒模型示意图
Figure 8. Schematic Diagram of Wrapping Wire Positioning Fuel Rod Model
图 9 定位绕丝数量对流体进出口压降影响
Figure 9. Influence of the Number of Positioning and Wrapping Wires on the Pressure Drop at Fluid Inlet and Outlet
图 10 定位绕丝数量对表面换热系数的影响
Figure 10. Influence of the Number of Positioning and Wrapping Wires on the Surface Heat Transfer Coefficient
图 11 不同形状绕丝定位棒束通道
Figure 11. Wrapping Wire Positioning Rod Bundle Channels with Different Shapes
图 12 不同形状绕丝定位棒束通道截面温度不均匀度对比
Figure 12. Cross Section Temperature Unevenness Comparison between Wrapping Wire Positioning Rod Bundle Channels with Different Shapes
表 1 不同形状绕丝定位棒束通道进出口压降
Table 1. Pressure Drop at Inlet and Outlet of Wrapping Wire Positioning Rod Bundle Channels with Different Shapes
参数名 参数值 圆形定位绕丝 矩形定位绕丝 梯形定位绕丝 归一化面积 0.78 1 1 进出口压降/Pa 31522.2 32152.2 29437.7 归一化进出口压降 0.98 1 0.91 
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