摘要
为研究核电厂"死管段"现象的产生机理,以指导工程上制定解决方案,使用计算流体力学(CFD)方法,采用封闭空间蒸发冷凝模型和Mixture多相流模型,通过求解可压缩控制方程探究死管段内自然对流及两相分布特性。与实验结果对比表明,本研究计算结果与实验结果基本一致;靠近阀瓣上部区域会出现局部的高温,在垂直方向上,温度会呈现较为明显的热分层现象;在加热过程中空泡份额及压力变化趋势基本一致,初始增长较快,最后趋于定值;腐蚀严重区域主要位于蒸汽含量较高、温度较高的区域,尤其是在气液交界面处,具有明显的腐蚀痕迹。
In order to study the thermal phenomena of NPP"dead legs"and to guide the strategy for engineering solution,in this study,a closed space evaporation-condensation model was proposed,and the mixture multiphase flow model and compressible control equations had also been used to investigate the natural convection and two-phase distribution characteristics in the dead-leg pipe.The result in the present work agrees well with the experimental results.The findings showed that the temperature near the valve is high in the vertical direction and the temperature will show a more obvious thermal stratification phenomenon;the change of the void fraction and the pressure is basically the same,and they are increasing at first,and then tend to be a fixed value.The serious corrosion is mainly located in the area with high void fraction and high temperature,especially at the interface.
作者
陈冲
王明军
田文喜
章静
秋穗正
苏光辉
Chen Chong;Wang Mingjun;Tian Wenxi;Zhang Jing;Qiu Suizheng;Su Guanghui(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an,710049,China)
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2020年第S01期46-50,共5页
Nuclear Power Engineering
基金
核技术创新联合基金(U1967203)
