立式螺旋管内气–液两相流动参数测量与流型研究  

Parameter Measurement and Flow Pattern Study on Gas-Liquid Two-Phase Flow in Vertical Helically Coiled Tube

作　　者：李熙 陈可欣 朱彦霖 王珩沅 李会雄[1] LI Xi;CHEN Kexin;ZHU Yanlin;WANG Hengyuan;LI Huixiong(Author information-State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《工程热物理学报》2024年第9期2687-2695,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.U20B2036)。

摘　　要：由于螺旋管蒸汽发生器内部气–液两相流的流型分布和转换规律相比直管更为复杂,准确测量两相流的流型分布及预测其转换规律对螺旋管蒸汽发生器的设计和运行安全有十分重要的意义。本文开发了用于螺旋管中两相流参数测量的双头电导探针测量系统,利用双头电导探针在水–空气两相流实验台上对内径为8 mm的立式螺旋管内气–液两相流的流动参数进行了测量,使用高速摄像机记录了各流型的典型相分布特征,结合探针测量得到的两相流参数与高速摄影图像对螺旋管两相流流型的特征及转换过程进行了分析。根据电导探针的测量数据,分析了气、液相的表观速率对空泡份额、气泡速度、气泡弦长的影响,得到了气泡弦长、空泡份额、高速摄影特征及采集电信号波形类型与流型之间的对应关系。研究发现,在本实验的工况范围内,立式螺旋管中气–液两相流主要包含四种流型:塞状流、弹状流、泡状流以及类环状流,其中,类环状流对应的两相流参数分布范围最广,并且其分布的参数范围比文献中报道的该流型的分布参数范围更大。Due to the more complex flow pattern distribution and transition characteristics in the gas-liquid two-phase flow in a helically coiled tube steam generator(HCT-SG)compared to a straight tube,accurately measuring the flow pattern distribution and predicting its transition rules are of great importance for the design and operational safety of HCT-SGs.In the present study,a two-sensor conductivity probe measurement system for measuring two-phase flow parameters in HCTs was developed.By using the conductivity probe,flow parameters of gas-liquid two-phase flow in a vertically HCT with an inner diameter of 8 mm were measured on a water-air two-phase flow experimental system.A high-speed camera was used to record the typical phase distribution characteristics of each flow pattern.The features and transition processes of two-phase flow patterns in the helical tubes were analyzed by combining the two-phase flow parameters obtained from probe with high-speed photographic images.Based on the measurement data from the conductivity probe,the effects of the superficial velocities of the gas and liquid phases on the void fraction,bubble velocity,and bubble length were analyzed,and the correspondence between bubble length,void fraction,highspeed photographic characteristics,electrical signals,and flow patterns was established.It was found that in the range of the present experiment,the flow regimes of gas-liquid two-phase flow in HCT could be divided into four types:plug flow,slug flow,bubble flow,and slug-annular flow.Among them,the two-phase flow parameters distribution range corresponding to the slug-annular flow is the widest,and the range of parameters for this flow pattern is larger than that reported in the literature.

关 键 词：螺旋管 气–液两相流 电导探针 两相流参数 流型 

分 类 号：TK121[动力工程及工程热物理—工程热物理]