Numerical Study of Gas-Lead-Bismuth-Alloy Two-Phase Flow Characteristics in Vertical Circular Tube
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摘要: 采用基于力平衡理论的漂移流模型，对竖直圆管道内气体-液态铅铋合金（LBE）两相流的空泡份额进行预测。通过数值计算得到气体-液态LBE两相流在不同流道半径、Bankoff指数、Galileo数下的液相流速分布、切应力分布和空泡份额分布规律，分析了漂移流模型分布参数与上述宏观参数的内在联系。研究结果表明，预测得到的空泡份额及分布参数演化规律都与实验结果符合较好。本研究建立的数值计算方法能够用于圆管内气体-液态LBE两相流流动特性研究，为铅铋快堆蒸汽发生器传热管破裂（SGTR）事故中空泡份额等关键两相流参数的快速测算提供参考。Abstract: This study adopts a drift flux model based on force balance theory to predict the void fraction of gas-liquid lead-bismuth two-phase flow in the vertical circular pipe. The distribution of liquid-phase flow velocity, shear stress distribution and void fraction distribution of gas-liquid lead-bismuth two-phase flow at different flow path radii, Bankoff exponents and Galileo numbers are obtained through numerical calculations. The intrinsic relationship between the distribution parameters of the drift flux model and the above macroscopic parameters is analysed. The results show that the predicted void fractions and the evolution of the distribution parameters are in good agreement with the experimental results. The numerical method established in this study can be used to study the flow characteristics of gas-liquid lead-bismuth two-phase flow in a circular tube, and provide reference for the rapid calculation of key two-phase flow parameters such as void fraction in steam generator tube rupture(SGTR) accident of lead-bismuth fast reactor.
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Key words:
- Drift flux model /
- Lead-bismuth alloy(LBE) /
- Two-phase flow /
- Void fraction
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图 1 α计算结果与实验值比较
Figure 1. Comparison of Void Fraction Calculation Results with Experimental Values
图 3 鼓泡床流道半径对混合长度的影响
Figure 3. Influence of Flow Channel Radius on Mixing Length in Bubble Column
图 4 P对α径向分布的影响
Figure 4. Influence of Exponent P on the Radial Distribution of Void Fraction
图 6 P对切应力径向分布的影响
Figure 6. Influence of Exponent P on the Radial Distribution of Shear Stress
图 7 不同αC下，C0随Ga的演化规律 (Fr=0.25)
Figure 7. Evolution of Distribution Parameter C0 with Ga for Different αC (Fr=0.25)
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