Neutronic and Thermal-Hydraulic Performance Analysis of Helical Cruciform Fuel Rods
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摘要: 为分析螺旋十字型燃料棒的中子物理及热工水力性能,使用基于计算机辅助设计(CAD)几何的反应堆蒙特卡罗程序RMC和商用计算流体力学(CFD)软件Fluent对螺旋十字型燃料棒进行数值模拟,并与传统圆柱型和无扭转十字型燃料棒进行对比。结果表明,螺旋十字型结构会略微降低反应性,增大径向功率峰因子;相较于圆柱型燃料棒,螺旋十字型燃料棒由于存在横向流动,能增强冷却剂交混,提升换热能力,在七棒束组件计算中,螺旋十字型燃料棒的平均温度和峰值温度都降低了约4 K。
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关键词:
- 螺旋十字型燃料棒 /
- 蒙特卡罗方法 /
- 计算流体力学(CFD) /
- 流动换热特性
Abstract: To analyze the neutronic and thermal-hydraulic performance of helical cruciform fuel (HCF) rods, numerical simulations using the CAD (computer-aided design)-based Reactor Monte Carlo code RMC and the commercial computational fluid dynamics (CFD) software Fluent were conducted, and the results were compared with those of traditional cylindrical and untwisted cruciform fuel rods. The results show that the helical cruciform structure slightly reduces the reactivity and increases the radial power peaking factor. Compared with cylindrical fuel rods, the HCF rods can enhance coolant mixing and heat transfer due to their transverse flow characteristics. In the 7-rods assembly calculation, the mean and peak temperatures of HCF rods are reduced by about 4 K. -
表 1 CSG、CAD建模的计算结果对比
Table 1. Comparison of Results between CSG and CAD Model
建模方式 有效增殖系数(keff) CSG 1.308667±0.000148 CAD 1.308611±0.000144 表 2 二维临界计算结果
Table 2. Two-dimensional Critical Calculation Results
截面类型 文献[9] 计算 keff dk/k keff dk/k 圆型 1.3513 — 1.3874±0.0001 — 十字型 1.3456 −0.0043 1.3843±0.0001 −0.0022 十字型45° 1.3486 −0.0020 1.3856±0.0001 −0.0013 dk/k—其他截面相对于圆型截面keff的相对误差 表 3 三维临界计算结果
Table 3. Three-dimensional Critical Calculation Results
单栅元模型 keff 圆柱型 1.313672±0.000144 十字型 1.308667±0.000148 螺旋十字型 螺距50 cm 1.308946±0.000153 螺距100 cm 1.308981±0.000149 表 4 功率峰因子对比
Table 4. Power Peaking Factor Comparison
截面类型 轴向功率峰因子 整体功率峰因子 圆柱型 1.50 1.81 十字型 1.49 2.00 螺旋十字型 1.49 2.08 表 5 流动参数对比
Table 5. Comparison of Flow Parameters
物理量 圆柱型 十字型 螺旋十字型 $ {\bar V_{\text{R}}}/({\text{m}} \cdot {{\text{s}}^{ - 1}}) $ 0.00148 0.00151 0.02492 $ {{\Delta }}P{\text{/Pa}} $ 974.38 993.43 1087.02 -
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