摘要
基于棒束通道注水再淹没系统,提出重力注水方案,运用RELAP5/MOD3.2建立其再淹没模型,模拟从棒束底部依靠重力注水再淹没高温棒束通道时的骤冷现象。模拟结果显示:再淹没的过程中出现持续的流动振荡,冷却水周期性地注入、逐出,振荡过程可分为初始阶段的剧烈振荡和后续阶段的平稳振荡,在此期间的注入流量,棒束通道汽空间压力,壁面温度和传热系数都出现相应的周期性变化;同时进一步模拟分析了注入水入口尺寸、初始包壳温度、蒸汽出口尺寸三个因素对振荡的影响机制,发现其振荡周期和振荡幅度随注入口的增大,初始包壳温度的升高、蒸汽出口尺寸的减小而增大。
Based on the bundle reflooding system,gravity water injection project is proposed and reflooding phenomena with injecting water by gravity is investigated with RELAP5 code.The results showed that,there appear continued flow oscillation during the bottom reflooding,it can be divided into two stage,serious oscillation in the initial stage and relatively stable oscillation at later stage.And at the same time,flow rate,the pressure of steam in upper bundle channel,the temperature of heating rod as well as the coefficient of heat transfer show intermittent changes.Meanwhile,the influencing mechanism about water inlet size,the initial temperature of heating rod,steam outlet size is further studied upon this continuous oscillation,and it is found that the period and amplitude of this flow oscillation increase along with the increase of water inlet size,initial temperature of cladding,and the decrease of steam outlet size.
作者
杨生兴
陈金波
YANG Sheng-xing;CHEN Jin-bo(CNNC Key Laboratory on Nuclear Reactor Thermal-Hydraulics Technology,Chengdu,610041,China;School of Mechanical Engineering,SJTU,Shanghai,200240,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2018年第6期960-969,共10页
Nuclear Science and Engineering
基金
中国核动力院核反应堆系统设计技术重点实验室基金资助项目
关键词
重力注水
再淹没
流动振荡
Gravity water injection
Reflooding
Flow oscillation
