均匀碎片床与分层碎片床干涸现象及热流密度实验研究  

Experimental Study on Dryout Heat Flux of Homogeneous Debris Bed and Stratified Debris Bed

作　　者：邹文斌 佟立丽[1] 曹学武[1] Zou Wenbin;Tong Lili;Cao Xuewu(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《核动力工程》2024年第1期60-64,共5页Nuclear Power Engineering

基　　金：国家自然科学基金(U1967202)。

摘　　要：碎片床的可冷却性是反应堆严重事故缓解策略关注的问题,碎片床结构对其可冷却性有重要影响。本文搭建了体积加热碎片床可冷却性实验装置,开展了均匀碎片床、轴向分层碎片床、径向分层碎片床的可冷却性实验,揭示了不同类型碎片床的干涸特性,获得了干涸热流密度(DHF)。研究结果表明:均匀碎片床条件下,小颗粒较大的气液流动阻力使得渗透率下降,导致小颗粒均匀碎片床DHF较小;轴向分层碎片床条件下,由于分层界面孔隙率降低引起的较大阻力,导致轴向分层碎片床DHF远小于顶部小颗粒组成的均匀碎片床DHF;径向分层碎片床条件下,由于小颗粒层较大的气液流动阻力会引起蒸汽向大颗粒层迁移和聚集,导致DHF低于大颗粒组成均匀床的DHF。The coolability of debris bed is a concern for reactor severe accident mitigation strategies,and the structure of debris bed has a significant impact on its coolability.In this paper,an experimental facility for the coolability of volumetrically heated debris bed was established,and the experimental study on the coolability of homogeneous,axial stratified,and radial stratified debris beds was carried out to compare and analyze the dryout phenomenon and heat flow flux for different debris bed types.The results show that under the condition of homogeneous debris bed,the larger gas-liquid flow resistance of small particles makes the permeability decrease,which leads to the smaller DHF of small particle homogeneous debris bed;under the condition of axial stratified debris bed,the DHF of axial stratified debris bed is much smaller than that of homogeneous debris bed composed of small particles at the top due to the large resistance caused by the decrease of porosity at the stratified interface;under the condition of radial stratified debris bed,due to the large gasliquid flow resistance of small particle layer,steam will migrate and accumulate to large particle layer,resulting in DHF lower than that of the homogeneous bed composed of large particles.

关 键 词：严重事故 分层碎片床 可冷却性 干涸热流密度(DHF) 

分 类 号：TL364[核科学技术—核技术及应用]