Evaluation of Single-phase and Two-phase Mixing Models for Rod Bundle Channel
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摘要: 本研究利用子通道程序，基于已有的实验数据，对棒束通道的单相和两相交混模型进行了评估。单相交混主要考虑横流和湍流交混，横流由守恒方程决定并在流量分布中占主导作用，湍流交混取决于交混系数，对湍流交混研究发现Sadatomi模型预测结果与实验结果吻合较好。两相交混由横流、湍流交混和空泡漂移共同作用，通过已有模型预测结果与实验数据对比分析，推荐两相交混中空泡漂移采用Hotta模型、湍流交混系数采用Sadatomi模型和两相乘子采用Beus模型，这是一个预测结果较为保守的组合模型，有利于反应堆安全的保守性评估。Abstract: In this study, the subchannel program is used to evaluate the single-phase and two-phase mixing model of the rod bundle channel based on the existing experimental data. The single-phase mixing mainly considers the cross flow and turbulent mixing. The cross flow is determined by the conservation equation and plays a leading role in the flow distribution. The turbulent mixing depends on the mixing coefficient. It is found that the prediction results of Sadatomi model are in good agreement with the experimental results in the study of turbulent mixing. Two-phase mixing is jointly caused by cross flow, turbulent mixing and void drift. Through the comparative analysis of the prediction results of the existing models and the experimental data, it is recommended to use the Hotta model for the void drift in the two-phase mixing, the Sadatomi model for the turbulent mixing coefficient, and the Beus model for the two-phase multiplier. This is a combined model with conservative prediction results, which is conducive to the conservative evaluation of reactor safety.
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Key words:
- Rod bundle channel /
- Mixing model /
- Void drift /
- Mixing coefficient /
- Two-phase multiplier
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图 1 交混系数两相乘子与空泡份额的关系
Figure 1. Relationship between the Two-phase Multiplier of the Mixing Coefficient and the Void Fraction
图 2 THERMIT-3和COBRA-TF程序计算结果的对比
μ —液相动力粘度，Pa·s
Figure 2. Comparison of THERMIT-3 and COBRA-TF Calculation Results
图 3 单相交混模型预测结果与实验结果比较
Figure 3. Comparison between Prediction Results of Single-phase Mixing Model and Experimental Results
图 4 两相交混模型预测结果与van der Ros和Tapucu实验结果比较
Figure 4. Comparison of Two-phase Mixing Models and Experimental Data of van der Ros and Tapucu
表 1 单相棒束几何结构及实验参数
Table 1. Single-phase Rod Bundle Geometry and Experimental Parameters
棒束类型 Sadatomi 2×3棒束 GE 3×3棒束 几何结构 
棒直径/mm 16.0 14.5 棒间距/mm 20.0 18.7 长度/mm 2250.0 1828.8 液相表观速度（jf）/(m·s−1) 0.7~2.0 0.69~2.82 
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表 2 两相实验几何结构和工况参数
Table 2. Geometry and Case Parameters of Two-phase Experiments
实验名称 van der Ros Tapucu 几何结构 
工况名称 通道1 通道2 通道1 通道2 uf=1.571 m/s uf=1.782 m/s, ug =1.803 m/s, α=0.262 Gf=3003.0 kg/(m2·s) Gf=2997.0 kg/(m2·s) Gg =5.1 kg/(m2·s) uf—液相速度；ug—气相速度；α—空泡份额；Gf—液相质量流量；Gg—气相质量流量
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表 3 两相交混组合模型
Table 3. Two-phase Mixing Combined Model
组合模型 交混系数 两相乘子 空泡漂移 模型1 Rogers & Rosehart模型 Beus模型 Hotta模型 模型2 Rogers & Rosehart模型 Kumamoto模型 Hotta模型 模型3 Sadatomi模型 Beus模型 Hotta模型 模型4 Sadatomi模型 Kumamoto模型 Hotta模型
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