摘要
为了研究蒸汽射流汽泡凝结形态特征和动力学参数规律,开展了蒸汽质量流率为8.34~50.13 kg/(m^(2)·s)、水温为40~80℃工况下,蒸汽射流汽泡凝结可视化实验。根据汽液相界面特征,得到了间歇振荡流型、光滑长大脱离型和粗糙长大脱离型3种典型汽泡流型。分析汽泡动力学行为发现,在水温一定时,随着蒸汽质量流率增加,最大汽泡半径呈现先增加后减小的规律,这是因为凝结流型从光滑长大脱离型汽泡流型转变为粗糙长大脱离型汽泡流型;这2个流型转变对应的最大汽泡半径称为阈值半径,阈值半径大小由表面张力、浮力、黏性力和凝结力等决定,与蒸汽惯性力无关。基于实验结果,给出了阈值汽泡半径预测模型,该模型能够较好地预测实验工况下不同水温阈值汽泡半径。
In order to study the condensation morphology characteristics and kinetic parameters of steam jet bubbles,visualization experiments are carried out under conditions with steam mass flow flux of 8.34~50.13 kg/(m^(2)·s)and water temperature of 40~80℃.According to the characteristics of the vapor-liquid interface,three typical condensation patterns are defined:intermittent oscillatory bubble regime,smooth grown detached bubble regime and rough grown detached bubble regime.The analysis on bubble dynamic behavior shows that,the maximum bubble radius increases at first and then decreases with the increase of steam mass flux when the water temperature is constant,because the condensation flow pattern changes from smooth grown detached bubble regime to rough grown detached bubble regime.The maximum bubble radius corresponding to these two flow patterns transitions is called the threshold radius.The threshold radius is determined by surface tension,buoyancy force,viscous force and condensation force,and is independent of steam inertia force.Based on the experimental results,a threshold bubble radius prediction model is presented,and the model can well predict the bubble radius of different water temperature thresholds under the experimental working conditions.
作者
呼浩
杨庆川
杨利
余小兵
薛彦平
张增平
HU Hao;YANG Qingchuan;YANG Li;YU Xiaobing;XUE Yanping;ZHANG Zengping(Shenhua Shendong Electric Power Co.,Ltd.Technology Research Institute,Xi’an 710076,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Xi’an TPRI Energy Conservation Technology Co.,Ltd.,Xi’an 710054,China;Dianta Power Plant of Shenhua Shendong Electric Power Co.,Ltd.,Shenmu 719316,China)
出处
《热力发电》
CAS
CSCD
北大核心
2022年第7期87-94,共8页
Thermal Power Generation
基金
国家能源集团国神公司科技项目(GSKJ-20-07)。
关键词
蒸汽射流
汽泡凝结
汽泡动力学
steam jet
steam bubble condensation
bubble dynamics
