较大管径中两相流动漂移流模型研究

摘要

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(Jg)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.%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 β<0. 027, and a more accurate correlation was proposed.