垂直管内气液两相逆流极限管径效应实验  

Experimental Study of Diameter Effect on Gas-Liquid Two-Phase Countercurrent Flow Limitations in Vertical Pipes

作　　者：马有福[1] 邵杰 陆鹏[2] 朱奎 Ma Youfu;Shao Jie;Lu Peng;Zhu Kui(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China;Shanghai Marine Diesel Engine Research Institute,Shanghai,200090,China)

机构地区：[1]上海理工大学上海市动力工程多相流动与传热重点实验室,上海200093 [2]中国船舶重工集团公司第七一一研究所,上海200090

出　　处：《核动力工程》2021年第1期28-34,共7页Nuclear Power Engineering

摘　　要：在压水堆安全性分析中,需准确预测气液逆流极限(CCFL)工况下两相流动关系。本文采用水下淹没排气的实验方法,对相同管长不同管径垂直管的CCFL特性进行可视化实验,并对垂直管CCFL关联式模型进行分析,主要结论有:①在CCFL工况下垂直管内流型为环状流动;表观气速较大时,大管径管内液膜呈搅拌状,小管径管内液膜呈波动状;随表观气速减小,均转为液面光滑的自由降膜流动;②Wallis数模型过度关联了管径变化对垂直管CCFL特性的影响;Kutateladze数和Froude-Ohnesorge数模型也不能良好关联垂直管CCFL特性的管径效应;③提出了新的CCFL无量纲参数和相应的实验关联式,由此可使垂直管CCFL特性的管径效应得以统一表征,还可以关联物性参数变化的影响。For the safety analysis of pressurized water reactors, it is necessary to accurately predict the gas-liquid flow relationship under the gas-liquid countercurrent limitation(CCFL) conditions. In this study, with the use of the experimental method of submerged exhaust, the CCFL characteristics of the vertical pipes with different pipe diameters and an identical pipe length were tested. Then, the CCFL correlation models for vertical pipes were analyzed. The main conclusions are: ①The flow pattern in vertical pipes is annular flow under the CCFL condition. When the superficial gas velocity is large, the liquid film in the large diameter pipe shows a churn-like motion, while the liquid film in the small diameter pipe behaves a stable falling flow with wavy interface. As the superficial gas velocity decreases, they both convert to a falling film flow with smooth interface. ②The model based on Wallis numbers presents an over-correlation to the effect of pipe diameters on the CCFL of vertical pipes;meanwhile, the models based on the Kutateladze number or the Froude-Ohnesorge number also fail to correlate well for the diameter effect on the CCFL of vertical pipes. ③A new dimensionless parameter is proposed to depict the CCFL of vertical pipes, which can correlate the diameter effect satisfactorily and can indicate the effect of fluid properties on the CCFL of vertical pipes simultaneously.

关 键 词：压水堆 垂直管 气液逆流极限(CCFL) 管径效应 预报模型 

分 类 号：TL334[核科学技术—核技术及应用]