自然循环U型管蒸汽发生器管内倒流受管长影响的理论研究  

Theory Study on Effect of U-Tube Length on Reverse Flow in UTSG

作　　者：王一浒 卢川[2] 丛腾龙 陈衣然 辛素芳 黄慧剑[2] 徐良剑[2] 巫英伟[1] Wang Yihu;Lu Chuan;Cong Tenglong;Chen Yiran;Xin Sufang;Huang Huijian;Xu Liangjian;Wu Yingwei(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an,710049,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China;Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University,Harbin,150001,China)

机构地区：[1]西安交通大学核科学与技术学院,西安710049 [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,成都610213 [3]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001

出　　处：《核动力工程》2021年第1期23-27,共5页Nuclear Power Engineering

摘　　要：自然循环U型管蒸汽发生器(UTSG)在一次侧处于自然循环工况下其部分U型管可能会出现倒流现象,这对自然循环带来不利影响。本文通过理论分析UTSG的U型管的水动力学曲线,获得U型管内发生流动不稳定时的临界压降与管长的关系,并利用系统分析程序RELAP5进行数值验证,验证结果表明:当管长增加时,临界压降呈先减后增的趋势,即小型的UTSG的最短U型管先出现倒流,而大型的UTSG最长管先出现倒流。所得结论解释了不同的仿真模拟研究得到的倒流管的分布不同的现象,为UTSG管内倒流及其管空间分布的预测提供理论依据。Under the natural circulation of the primary loop, the backflow may occur in the partial U-tubes of an inverted U-tube steam generator(UTSG), which brings negative effect on natural circulation. The relationship between the critical pressure drop and the tube length of the inverted U-tube is deduced by theoretically analyzing the hydrodynamic curve of the inverted U-tube of a steam generator in a UTSG, and the numerical analysis is performed using the system analysis program RELAP5. It is shown that the critical pressure drop decreases first and then increases when the pipe length increases, that is, the shortest inverted U-shaped tube of the small UTSG steam generator first reverses, while the longest tube of the large UTSG steam generator first reverses. The conclusions explain the phenomenon of different distribution of the reflux tubes obtained by different simulations, and provide a theoretical basis for the prediction of the spatial distribution of the reflux tubes in the inverted U-tube of the UTSG.

关 键 词：U型管蒸汽发生器(UTSG) 倒流 RELAP5 流动不稳定 判别准则 

分 类 号：TL353.13[核科学技术—核技术及应用]