【作者】 李仲春； 宋小明； 姜胜耀； 俞冀阳； Mamoru Ishii；

【Author】 Li Zhongchun;Song Xiaoming;Jiang Shengyao;Yu Jiyang;Mamoru Ishii;Nuclear Power Institute of China;Tsinghua University;Purdue University;

【机构】 中国核动力研究设计院核反应堆系统设计技术重点实验室； 清华大学； Purdue University；

【摘要】 相间升力模型是目前广泛应用欧拉-欧拉两流体框架中重要封闭模型,其对于相分布特性预测具有显著影响。基于实验和数值模拟等手段,目前开发了较多的相间升力模型,但现有升力模型的适用性需要进一步评价拓展。本文首先对现有的实验数据进行总结,然后基于已有实验基础对现有相间升力模型进行评价,最后,结合相间曳力实验结果,提出相间升力模型的框架与影响分析。比较结果表明,现有模型在椭球型气泡区域预测还存在较大偏差,而目前仍然没有描述球帽型气泡的相间升力模型。基于相间曳力和升力表现出较为一致特征,相间升力模型同样需要对界面条件,气泡形状和流体状况进行考虑。更多还原

【Abstract】 Lift force is one of the most important closure relations in the framework of two-fluid modeling, which has great effect on the prediction of void fraction distribution. As numerous models have been developed in this area, the applicability of these models needs further evaluation. The experiment data was first collected and compared with available models’ prediction. The framework for the development of lift force was proposed based on the comparison results. The results indicated that the model for spherical bubble was adequate and large contradictory was presented for oblate bubble and no available model was suitable to model the lift force for spherical cap bubble. The framework of the lift force modeling was proposed based on the similarity between drag force and lift force, where interfacial condition, bubble shape and fluid flow condition need to be included.更多还原