摘要
对窄缝通道内过冷条件下单蒸汽泡运动特性进行了实验研究,分析了过冷度对单蒸汽泡运动特性的影响。实验结果表明,过冷条件下,单蒸汽泡在上升过程中,其尺寸不断减小,形状也不断改变;单蒸汽泡界面存在冷凝现象,过冷度越大,直径减小越快,同一直径蒸汽泡的纵横比在一个范围内波动;过冷条件下,单蒸汽泡的z向速度和x向速度都随着直径的增大先增加后减小,均在直径约10 mm时具有最大值;单蒸汽泡z向速度则随着过冷度的增大而增大,而x向速度在零上下波动,随过冷度增大略有增大。过冷度会影响窄缝通道内单蒸汽泡的行为特性,并进一步影响流型形成与演变。
Experimental study was carried out on the behaviour of single vapor bubbles under subcooling condition in a narrow channel. The effect of subcooling degree was analyzed. Results showed that the single vapor bubbles rose with the decreasing diameter and the changing shape under subcooling conditions. Condensation happened on the interface of single vapor bubbles. Increasing degree of subcooling, the diameter of single vapor bubbles decreased faster. The aspect ratio of single vapor bubbles with the same diameter fluctuated in a scope. Under subcooling conditions, the velocity in z and x direction both first increased then decreased with the increasing diameters. The two velocities both had the maximum value for the bubbles of 10 mm diameter. Larger degree of subcooling induced larger bubble velocity in z direction. The velocity in x direction swung around zero. Increasing the degree of subcooling, the bubble velocity in x direciton increased slightly. The degree of subcooling will affect the behavior of single vapor bubbles in narrow channels, and influence the formation and the evolution of flow regimes in further.
作者
张利琴
黄彦平
昝元锋
王俊峰
Zhang Liqin;Huang Yanping;Zan Yuanfeng;Wang Junfeng(CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Nuclear Power Institute of China,Chengdu,610213,China)
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2020年第3期57-61,共5页
Nuclear Power Engineering
基金
国家自然科学基金(51176176)
国家联合基金(U1867218)。
关键词
单蒸汽泡
行为特性
窄缝通道
过冷度
热工水力
Single vapor bubble
Behavior
Narrow channel
Degree of subcooling
Thermal hydraulics
