铅铋-水反应实验的CFD预计算  

Computational fluid dynamics pretest of LBE-water interaction

作　　者：邓畅 张林 刘晓晶[1,2] DENG Chang;ZHANG Lin;LIU Xiaojing(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Digital Nuclear Reactor Technology Intergration Innovation Center,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 [2]上海市数值反应堆技术融合创新中心,上海200240

出　　处：《核技术》2025年第3期145-154,共10页Nuclear Techniques

基　　金：国家自然科学基金(No.U22B2090)资助。

摘　　要：铅铋堆蒸汽发生器发生传热管破裂事故(Steam Generator Tube Rupture,SGTR)后,二次侧高压过冷水将喷放进入一次侧的高温铅铋熔融物中。该现象可能的后果有铅铋凝固,压力波造成堆内构件损坏以及蒸汽迁移进入堆芯引入意外反应性。为了研究该过程,上海交通大学先进核能系统实验室搭建了大型铅铋-水反应实验装置台架。在实验开始前,针对该台架预先开展计算流体动力学(Computational Fluid Dynamics,CFD)计算以认识实验现象并确定实验工况。本文首先利用已有的实验数据进行方法验证,然后基于商用CFD软件Fluent建立了该实验装置的二维模型,开展了不同水进口速度、水进口温度和熔融物初始温度的多工况仿真研究。结果表明,射流过程可分为三个阶段,设计工况不会出现铅铋凝固。铅铋最低温度随着水的进口温度降低或其进口速度增大而降低。同时,蒸汽最大穿透深度随着水的进口温度升高或速度增大而增大。本研究取得的结论能够为拟开展的实验提供有力参考。[Background]After a steam generator tube rupture(SGTR)accident occurs in a lead-bismuth eutectic(LBE)alloy-cooled reactor,supercooled water on the secondary side is injected into the high-temperature molten LBE on the primary side.Possible consequences arising from SGTR include LBE solidification,damage to the reactor components caused by pressure waves,and unexpected reactivity owing to steam migration into the reactor core.[Purpose]This study aims to conduct a computational fluid dynamics pre-computation for the LBE alloycooled reactor to clarify the phenomena and determine the working conditions of LBE-water interaction.[Methods]Firstly,a large experimental platform for the LBE-water interaction was set up by the Innovative Nuclear System Laboratory in Shanghai Jiao Tong University.Then,the physical process of of LBE-water interaction was described on the basis of Fluent,coupling VOF model,Lee model,and SST k-ωmodel,and the numerical methodology with existing experimental data was validated.Thereafter a two-dimensional model of the experimental facility was established using ANSYS Fluent.Finally,multi-case simulations were conducted to simulate the overall process of the experiment and examine the effects of water inlet velocity,water inlet temperature,and initial LBE temperature.[Results]The simulation results indicate that the jetting process can be divided into three stages and LBE solidification is avoided under the designed conditions.The minimum LBE temperature decreases with lower water inlet temperatures or higher inlet velocities.Concurrently,the maximum void penetration depth increases with elevated water inlet temperatures and velocities.[Conclusions]The results of this study provide a valuable reference for future experimental studies.

关 键 词：铅铋-水反应 蒸汽发生器传热管破裂 数值模拟 参数分析 

分 类 号：TL3[核科学技术—核技术及应用]