倾斜管内气液两相逆流极限实验研究  

Experimental Study on Gas-Liquid Counter Current Flow Limitation in Inclined Pipes

作　　者：马有福[1,2] 韩林峰 温慧铭 吕俊复 王硕 Ma Youfu;Han Linfeng;Wen Huiming;Lyu Junfu;Wang Shuo(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China;Shanxi Research Institute of Huairou Laboratory,Taiyuan,030032,China;Department of Energy and Power Engineering,Tsinghua University,Beijing,100084,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]怀柔实验室山西研究院,太原030032 [3]清华大学能源与动力工程系,北京100084

出　　处：《核动力工程》2024年第3期51-59,共9页Nuclear Power Engineering

摘　　要：失水事故下压水堆热段内气液两相顺利逆流对防止堆芯熔化事故至关重要,而热段是由水平管与倾斜管组合而成。为探明热段内气液逆流的约束机制,以常温空气/水为两相工质对倾斜管与水平管内气液两相逆流极限(CCFL)特性进行实验,研究了管道倾角(0°~30°)和管径(40~100 mm)对管内CCFL的影响。主要结论有:CCFL工况下,水平管内呈分层流;随管道倾角和管径增大,倾斜管内分层流逐渐过渡为雾状流;相同管径下,以表观流速表征的CCFL曲线随管道倾角增大而升高,意味着热段内气液逆流主要受水平段控制;相同管道倾角下,倾斜管与水平管的CCFL表观流速曲线均随管径增大而升高;传统Wallis参数未反映管道倾角对CCFL的影响,也未能准确表征管径对水平管CCFL的影响,但Wallis参数可良好关联管径对倾斜管CCFL的影响;提出了可同时关联管道倾角与管径影响的倾斜管CCFL实验关联式。研究结果对压水堆核电厂的安全性分析提供了基础数据和实验关联式。The smooth countercurrent of gas and liquid phases in the hot leg of pressurized water reactor(PWR)is very important to prevent the core melting accident,and the hot leg is composed of horizontal pipe and inclined pipe.In order to determine the constraint mechanism of gas-liquid countercurrent in the hot leg,experiments were carried out on the characteristics of countercurrent flow limitation(CCFL)in inclined and horizontal pipes with ambient air/water as two-phase working medium,and the effects of pipe layout inclination angle(0°~30°)and pipe diameter(40~100 mm)on CCFL in the pipes were studied.The main conclusions are as follows:under the CCFL conditions,the flow pattern in the horizontal pipe shows a typical stratified flow;in the inclined pipe,as the inclination angle and diameter of the pipe increase,stratified flow gradually transits to mist flow.At the same pipe diameter,the CCFL curve characterized by superficial velocities increases with the increase of pipe inclination,which indicates that the gas-liquid countercurrent flow in the hot leg is mainly controlled by the horizontal section.At the same pipe inclination angle,the CCFL curves for both inclined and horizontal pipes increase with the increase of pipe diameter.The conventional Wallis parameters do not reflect the effect of pipe inclination on the CCFL,and also fail to accurately characterize the effect of pipe diameter on the CCFL of horizontal pipes;however,they can correlate the effect of pipe diameter on the CCFL of inclined pipes satisfactorily.Finally,an experimental correlation,which can simultaneously correlate the effects of pipe inclination and diameter,was proposed for the CCFL of inclined pipes.The research results provide basic data and experimental correlation for the safety analysis of PWR nuclear power plant.

关 键 词：压水堆 失水事故 气液两相逆流极限(CCFL) 倾斜管 管径效应 

分 类 号：TL334[核科学技术—核技术及应用]