基于CFD的竖直圆管内空气-水逆向流动界面行为研究  

Study on the Interfacial Behavior of the Air/Water Counter-current Flow in the Vertical Tube Based on the CFD

作　　者：万洁 孙皖 李想[1,2] 朱隆祥 马在勇 张卢腾 潘良明[1,2] WAN Jie;SUN Wan;LI Xiang;ZHU Longxiang;MA Zaiyong;ZHANG Luteng;PAN Liangming(Key Laboratory of Low-Grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;Department of Nuclear Engineering and Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]重庆大学核工程与核技术系,重庆400044

出　　处：《核科学与工程》2023年第5期1105-1112,共8页Nuclear Science and Engineering

基　　金：国家重点研发计划资助项目(2018YFB1900400)。

摘　　要：为研究空气-水逆向流动局部特性,本文基于VOF(volume of fluid)模型对D=25 mm的圆管中气液逆向流动过程中界面波的演变开展了数值计算,分析了流动过程中界面波波形的变化,计算结果与实验中液膜厚度变化符合较好。对不同液相流速工况下的流场变化分析可得,流动过程中界面波前后产生的压差引入了削弱界面波稳定性的附加作用力,且界面波前后压力变化随液相流速的增大而增大;与此同时,气相流速越大,界面波波幅沿轴向发展越迅速,表明界面波的不稳定性随气相流速的增大而增大。由此可得,气相流速及液相流速的增大都会使界面波的稳定性降低,即更容易发生液泛。In order to study the local characteristics of the air-water counter-current flow,a numerical simulation of interfacial wave in a vertical tube with 25 mm diameter has been carried out based on the VOF(volume of fluid)model.The change of interfacial wave was analyzed and showed a good agreement with the experimental film thickness. Through theanalysis of the variation of the flow field under different liquid flow rates, it can be concludedthat the pressure difference generated between the windward and leeward of the interfacialwave introduces an additional force, which weakens the stability of the interfacial wave. Andthe pressure difference increases with the increase of the liquid flow rate. Moreover, the greaterthe gas flow rate, the faster the amplitude of the interfacial wave develops along the axialdirection, indicating that the instability of the interfacial wave increases with the increase ofthe gas flow rate. Consequently, the increase of the gas and liquid flow rate reduces thestability of the interfacial wave, namely, the flooding is more likely to occur.

关 键 词：CFD 液泛 VOF 界面波 液膜厚度 

分 类 号：TL334[核科学技术—核技术及应用]