CAJ | 학술논문

借助双探头光纤探针测量方法，对管内竖直向下空气-水两相流动的界面参数局部分布特性进行了实验研究。实验段采用内径50 m m、长度2000 m m的圆管，气液两相表观速度范围分别为0.004～0.077 m/s和0.43～0.71 m/s。实验结果表明，不同于竖直向上两相流动中局部界面参数径向分布呈现的“壁峰”或“核峰”型分布，向下流动中局部界面参数径向分布呈“壁峰”或“宽峰”型分布；向下流动时空泡份额截面平均值均比向上流动时大119.6％～145.0％，界面面积浓度截面平均值比向上流动时大18.8％～82.5％；向下流动时界面参数分布表现出明显的均匀化趋势。
차조쌍탐두광섬탐침측량방법，대관내수직향하공기-수량상류동적계면삼수국부분포특성진행료실험연구。실험단채용내경50 m m、장도2000 m m적원관，기액량상표관속도범위분별위0.004～0.077 m/s화0.43～0.71 m/s。실험결과표명，불동우수직향상량상류동중국부계면삼수경향분포정현적“벽봉”혹“핵봉”형분포，향하류동중국부계면삼수경향분포정“벽봉”혹“관봉”형분포；향하류동시공포빈액절면평균치균비향상류동시대119.6％～145.0％，계면면적농도절면평균치비향상류동시대18.8％～82.5％；향하류동시계면삼수분포표현출명현적균균화추세。
Experimental study was performed on distribution characteristics of interfacial parameters of downward gas-liquid flow in a vertical circular tube with the measurement by a two-sensor optical fiber probe .The test section is a circular pipe with the inner diameter of 50 mm and the length of 2 000 mm .The superficial velocities of the gas and the liquid phases cover the ranges of 0.004-0.077 m/s and 0.43-0.71 m/s ,respectively . The results show that the distributions of the interfacial parameters in downward bubbly flows are quite different from those in upward bubbly flows .For the case of upward flow ,the parameters present the“wall-peak” or “core-peak” distributions ,but for the case of downward flow , they show “wall-peak” or “wide-peak” distributions . The average value of void fraction in vertical downward flow is about 119.6%-145.0% larger than that in upward flow ,and the interfacial area concentration is about 18.8%-82.5%larger than that in upward flow .The distribution of interfacial parameters shows an obvious tendency of uniformity .