摇摆条件下圆管DNB型临界热流密度数值研究  

Numerical Study on DNB-Type Critical Heat Flux in Circular Tube under Rolling Condition

作　　者：方正 杜松 步珊珊 李振中 陈德奇[1] Fang Zheng;Du Song;Bu Shanshan;Li Zhenzhong;Chen Deqi(Key Laboratory of Low-grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing,400044,China;Guizhou Yuping Clean Thermal Power Co.,Ltd.,Tongren,Guizhou,554300,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]贵州玉屏清洁热能有限公司,贵州铜仁554300

出　　处：《核动力工程》2024年第4期24-31,共8页Nuclear Power Engineering

摘　　要：针对摇摆条件下的竖直圆管内偏离核态沸腾(DNB)临界热流密度(CHF)进行了三维数值计算,采用欧拉两相流模型和非平衡壁面沸腾模型,通过将静止管道的CHF模拟值和实验值进行对比,完成了不同壁面沸腾子模型的敏感性分析。对15种振幅和周期组合的正弦简谐摇摆运动的竖直管道的CHF进行预测。结果表明:所有摇摆条件均导致了DNB现象的提前发生,在最“剧烈”的摇摆情况下,CHF的值最小。管道内的温度和换热系数会随着摇摆运动发生周期性的改变。在一个周期内,更大的振幅和更小的周期都会导致加热壁面在某时刻出现更小的换热系数,从而导致壁面最高温度上升。本研究可以为摇摆条件下DNB型CHF的数值预测提供参考。A three-dimensional numerical calculation was carried out on the departure from nucleate boiling(DNB)type critical heat flux(CHF)in a vertical circular tube under different rolling conditions.The Euler two-phase flow model and the non-equilibrium wall boiling model were used.By comparing the simulated CHF values of static tubes with experimental values,a sensitivity analysis of different wall boiling sub-models was completed.The CHF of a vertical tube with sinusoidal simple harmonic rolling motion is predicted for 15 combinations of amplitude and period.The results show that all rolling conditions lead to the early occurrence of DNB.In the most"violent"rolling situation,the value of CHF is the smallest.The temperature and heat transfer coefficient in the tube will change periodically with the rolling motion.Within a period,larger amplitude and smaller period will cause the heating wall to have a smaller heat transfer coefficient at a certain moment,resulting in an increase in the maximum temperature of the wall.This study can provide a reference for the numerical prediction of DNB-type CHF under rolling conditions.

关 键 词：偏离核态沸腾(DNB) 临界热流密度(CHF) 摇摆条件 数值研究 

分 类 号：TL334[核科学技术—核技术及应用]