基于竖直圆管空气-水两相流实验的相间曳力模型研究  

Study on Interfacial Drag Model Based on Air-water Two-phase Flow Experiment in Vertical Pipe

作　　者：张卢腾 黄涛 张牧昊 祝文 何清澈 许汪涛 孙皖 马在勇 丁书华[2] 李仲春[2] 潘良明[1] ZHANG Luteng;HUANG Tao;ZHANG Muhao;ZHU Wen;HE Qingche;XU Wangtao;SUN Wan;MA Zaiyong;DING Shuhua;LI Zhongchun;PAN Liangming(Key Laboratory of Low-grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610059,China;College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,Chengdu 610059,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]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610041 [3]成都理工大学核技术与自动化工程学院,四川成都610059

出　　处：《原子能科学技术》2022年第8期1499-1505,共7页Atomic Energy Science and Technology

基　　金：国家重点研发计划(2018YFB1900400)。

摘　　要：研究两相流相间阻力特性对系统程序关键本构模型封闭具有重要意义。本文基于竖直圆管开展了空气-水两相流实验,采用四探头电导探针对空泡份额、气泡弦长和界面面积浓度等气泡参数的径向分布进行了测量。结果表明空泡份额和气泡弦长呈现“核峰型”分布,而界面面积浓度并没有表现出随流速的单调关系。进一步开发了泡状流和弹状流的相间曳力模型,考虑了液相表观流速与管径对气泡尺寸分布的影响,建立了临界韦伯数与不同液相流速的关系。计算得到的空泡份额和界面面积浓度与实验数据整体符合较好,验证了模型的可靠性,为两相流相间阻力特性研究提供参考意义。The study of interfacial drag characteristics in two-phase flow is of great significance for the closure of key constitutive models in system program.In this paper,the air-water two-phase flow experiment covering bubbly flow and slug flow regimes was carried out in vertical pipe with 25 mm diameter.The four-sensor conductivity probe was used to measure local radial distribution of bubble parameters.The probe included one long needle and three short needles,resulting in four pairs of positive and negative electrodes respectively with the stainless-steel tube at perpendicular angle.The local void fraction could be obtained based on the time proportion with high voltage.The bubble velocity and chord length could be calculated according to the time gap between bubbles contacting two adjacent needle tips in turn.The interfacial area concentration could be calculated with the bubble velocity at normal direction.The measurement uncertainties from four-sensor conductivity probe are about 10%,guaranteeing the accuracy of experimental results.The experimental results present that the void fraction and bubble chord length are both characterized with central peak distribution due to the lift force.While the relationship between interfacial area concentration and flow velocity is not monotonous.This is because that the interfacial area concentration results are affected by both factors.The interfacial area concentration is directly proportional to void fraction and inversely proportional to bubble chord length.The interphase drag models in bubbly flow and slug flow are further developed.The effects of liquid superficial velocity and pipe diameter on bubble size distribution are considered.And the relationship between critical Weber number and different liquid velocities is established.The calculated interfacial area concentration is compared with experimental data and RELAP5 predicted results.The RELAP5 predicted results are obviously lower than the experimental data.The present model greatly improves the calculation accuracy

关 键 词：两相流 竖直圆管 相间曳力 空泡份额 界面面积浓度 

分 类 号：TL334[核科学技术—核技术及应用]