矩形窄缝通道底部再淹没实验研究  

Experimental Study of Bottom Reflooding in a Narrow Rectangular Channel

作　　者：邓永皓 许巍[1] 刘晓晶[1] 郭玖元 吴丹[2] Deng Yonghao;Xu Wei;Liu Xiaojing;Guo Jiuyuan;Wu Dan(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China;Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]上海交通大学核科学与工程学院,上海200240 [2]中国核动力研究设计院,成都610213

出　　处：《核动力工程》2021年第6期17-23,共7页Nuclear Power Engineering

基　　金：国家青年基金(11922505)。

摘　　要：为了解矩形窄缝通道在失水事故(LOCA)下底部再淹没过程中的热工水力特性,在不同实验条件下开展再淹没实验研究。矩形窄缝通道由2块因科镍合金焊接而成,本研究根据温度变化曲线分析底部再淹没过程,计算并对比不同实验工况下的骤冷前沿的推进速度(骤冷速度),以及研究实验参数对再淹没过程的影响。实验结果表明,底部再淹没骤冷速度随着系统压力增大、进口流速增大、初始壁面温度降低以及冷却水过冷度的增大而增大。对比分析底部与联合再淹没工况,结果表明流量相同的情况下,底部再淹没的骤冷速度大于联合再淹没。本文研究为板状燃料元件反应堆事故预防以及事故缓解等研究奠定了基础。In order to investigate thermal hydraulic characteristics during bottom reflooding when LOCA occurs in a narrow rectangular channel,the reflooding experiments were carried out under different conditions.The narrow rectangular channel was made by welding two Inconel alloy plates.This study analyzes the bottom reflooding process according to the temperature variation curve,calculates and compares the advancing speed of the quench front(quench speed)under different experimental conditions,and studies the influence of experimental parameters on the reflooding process.Experimental results indicated that quench velocity under bottom reflooding is increasing with increased system pressure,increased inlet velocity,reduced initial wall surface temperature and increase in the degree of subcooling of the coolant.A comparative analysis of the bottom and combined reflooding case indicates that quench velocity under bottom reflooding is higher than that during combined reflooding with the same flow rate.This study lays the foundation for the research of accident prevention and mitigation of plate fuel element reactors.

关 键 词：矩形窄缝通道 失水事故 再淹没 骤冷速度 

分 类 号：TL364[核科学技术—核技术及应用]