铅铋冷却带绕丝棒束内腐蚀产物沉积特性数值模拟研究  

Numerical Study of Deposition Characteristic of Corrosion Product in Lead-bismuth Cooled Wire-wrapped Rod Bundle

作　　者：黄睿 孙毓博 傅俊森 肖瑶 顾汉洋[1] HUANG Rui;SUN Yubo;FU Junsen;XIAO Yao;GU Hanyang(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：《原子能科学技术》2025年第3期597-606,共10页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12322510,12075150,12275174);上海市青年科技启明星计划(22QA1404500)。

摘　　要：液态铅铋合金在流动过程中会腐蚀管道产生腐蚀产物与氧化物颗粒,在燃料棒表面沉积、聚集后会使传热恶化并可能造成安全隐患。因此,本文以19棒束铅铋燃料组件为参考对象,基于ANSYS Fluent中的离散相模型对铅铋冷却带绕丝棒束内的颗粒物运动沉积过程进行了数值模拟,获得了颗粒物在带绕丝棒束通道内的沉积特性,分析了入口流速、入口温度与颗粒物粒径对颗粒物沉积的影响。结果表明:颗粒物在轴向上的主要沉积位置为通道入口处,在燃料棒周向上的主要沉积位置为绕丝迎风面与燃料棒表面的狭缝处,在流道壁面的主要沉积位置为绕丝位于角子通道内时对应的棱附近;颗粒物粒径、流体流速以及流体入口温度的升高会使得燃料棒包壳表面和流道壁面的沉积率增大,但对沉积的轴向分布无明显影响。本文结果可为铅基堆的反应堆安全设计提供参考。Lead-based reactor using liquid lead-bismuth alloys as coolant has many advantages and is a promising type of fourth-generation reactors for a wide range of applications.However,the compatibility problem between liquid metal and structural materials exists in lead-based reactors.Corrosion products are generated from the core,precipitate as oxide particles at the cold end of the circuit,and undergo deposition in the steam generator,piping,and within the core as the coolant flows.During the flow process,lead-bismuth alloy will corrode the structural material and produce corrosion products,which will deteriorate the heat transfer and may cause safety hazards after deposition and aggregation on the surface of fuel rods.Therefore,a numerical study of particle deposition which takes a 19 wire-wrapped rod bundle fuel assemble as a reference object was carried out based on the discrete phase model(DPM)in ANSYS Fluent.Deposition characteristics of oxide particles in the rod bundle were obtained.Specifically,the axial and circumferential deposition distributions of corrosion product particulate oxide particles on the fuel rod cladding and hexagonal flow channel walls were investigated,respectively.Besides,effect of inlet flow velocity,fluid inlet temperature and particle diameter on the deposition characteristics were also analyzed.The results show that the main deposition location in the axial direction is the inlet of the rod bundle.In the circumferential direction,the main deposition position on the fuel rod is the gap between the windward side of the wire and the fuel rod surface,and the main deposition position on the hexagonal flow channel wall is near the prongs that correspond to the wrapped wire when it is in the angular sub-channel.The effect of the inlet boundary conditions on the particle deposition rate and deposition distribution is as follows.An increase in the inlet flow velocity enhances the deposition rate,but the lift effect decreases as the flow rate increases.An increase of the fluid inlet temperature

关 键 词：铅基堆 液态铅铋合金 颗粒物沉积 带绕丝棒束 

分 类 号：TL334[核科学技术—核技术及应用]