球形燃料孔隙内汽泡生长与脱离  

Bubble Growth and Departure in Porous Media Composed of Spherical Fuel Elements

作　　者：张晓杰 白博峰[2] ZHANG Xiaojie;BAI Bofeng(Hualong Pressurized Water Reactor Technology Corporation,Ltd.,Beijing 100036,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an of Shaanxi Prov.710049,China)

机构地区：[1]华龙国际核电技术有限公司,北京100036 [2]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《核科学与工程》2020年第5期916-924,共9页Nuclear Science and Engineering

摘　　要：根据汽泡动力学原理及可视化试验结果,分别构建了球形燃料孔隙内的汽泡滑移和脱离模型,并对汽泡受力及传热进行分析,通过计算得到了汽泡滑移临界曲率半径、汽泡脱离半径的变化规律。汽泡滑移时的临界半径主要受颗粒大小影响,颗粒越大,汽泡的相对临界半径r cr/R p越小。颗粒半径对汽泡脱离半径的影响最大,颗粒半径越大,汽泡的相对脱离半径r d/R p越小。流速、压力、壁面过热度对汽泡脱离半径也有影响,其他条件相同时,流速越大,汽泡脱离半径越小;压力越大,汽泡脱离半径越大;壁面过热度越大,汽泡脱离半径越大。Models for both bubble slide and bubble departure were established based on principles of bubble dynamics and visual experiments,and the variation of the bubble sliding critical radius and departure radius were obtained by heat transfer and force calculation.The bubble sliding critical radius is mainly affect by particle size;the relative bubble critical radius(rcr/Rp)will decrease with the increase of the particle size.The particle radius has the greatest influence on the bubble departure radius;the relative bubble departure radius(rd/Rp)will decrease with the increase of the particle radius.The fluid velocity,fluid pressure and heated wall temperature also have influence on the bubble departure radius,under same condition the bubble departure radius will increase with the decrease of fluid velocity,with the increase of fluid pressure or with the increase of heated wall temperature.

关 键 词：球形燃料孔隙 汽泡 滑移 脱离 

分 类 号：TK124[动力工程及工程热物理—工程热物理]