较大管径中两相流动漂移流模型研究

漂移流模型作为一种简单实用的模型，在反应堆热工水力及安全分析，特别是在空泡份额的计算方面，应用非常广泛。针对不同的通道及流型，研究者提出了多种基于漂移流模型的计算方法。通过较大通道中两相流动过程的实验研究，对5种空泡份额计算模型进行评价分析。结果表明，基于常规通道的Hibiki-Ishii模型与实验值吻合较好，平均相对误差为14.1%。结合对气泡运动过程的研究，发现在〈J_g〉β<0.027区，分布参数C₀<1，据此，给出了在较大管径通道中计算精度更高的模型关系式。

Study on Drift-Flux Model for Two-Phase Flow in Relative Large Diameter Channel

The drift-flux model, as its simplicity, has been widely used in the thermal-hydraulic and accidents analysis, especially in the calculation of void fraction. In view of different-channels and flow regimes, researchers have developed some correlations based on the drift-flux model, five of which were evaluated against the experimental results. The Hibiki-Ishii model for conventional channel is the best with average relative error of 14.1%. Combined with the investigation of bubble motion, it is found that the value of distribution parameter is less than one when 〈J_g〉β<0.027, and a more accurate correlation was proposed.