【作者】 张牧昊； 潘良明； Peng Ju； Xiao-hong Yang； 何辉； Mamoru Ishii；

【Author】 Muhao Zhang;Liang-ming Pan;Peng Ju;Xiaohong Yang;Hui He;Mamoru Ishii;Department of Nuclear Engineering,Chongqing University;School of Nuclear Engineering,Purdue University;

【机构】 重庆大学动力工程学院； Purdue University,School of Nuclear Engineering；

【摘要】 本文通过采集25.4mm圆管内气液两相竖直向上流动过程中的空泡份额分布情况,应用模糊C-均值聚类(FCM)算法,对流型进行客观识别。基于识别结果,确定Kelvin-Helmholtz(K-H)流动不稳定性发生的流型区域,分析其对流型转变的影响。研究发现,在低液相流速下,K-H流动不稳定性发生在弹状流向搅混流转变区域附近;对于高液相流速,流动不稳定性发生在弹状流向环状流转变区域附近。K-H流动不稳定性对搅混流的产生和发展具有重要影响。更多还原

【Abstract】 air-water two-phase vertical upward flow experiments were conducted in a tubular test section with the inside diameter of 2.54 cm and by using the Fuzzy-C clustering(FCM) algorithm, the flow regime map is built to locate the occurrence of Kelvin-Helmholtz(K-H) instability. The present research finds that in low liquid flow rates, the K-H instability appears at the transition boundary between slug flow and churn-turbulent flow. However, it is the transition area of slug to annular flow in which the K-H instability occurs in high liquid flow rates. The K-H instability plays an important role in the generation and development of churn-turbulent flow.更多还原