Impact of PbO Fouling Layer on Steady-state Heat Transfer Performance of Wire-wrapped Fuel Assemblies for Lead-Bismuth Reactors

HE Lifen; HUANG Junlin; ZHU Xiaoliang; HAN Bin; WANG Feifei; GUO Jianwei; TU Yiyou; XU Qinglan

doi:10.19805/j.cnki.jcspe.2026.240801

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Impact of PbO Fouling Layer on Steady-state Heat Transfer Performance of Wire-wrapped Fuel Assemblies for Lead-Bismuth Reactors

更新时间：2026-10-10

- Impact of PbO Fouling Layer on Steady-state Heat Transfer Performance of Wire-wrapped Fuel Assemblies for Lead-Bismuth Reactors
- Chinese Journal of Power Engineering Vol. 46, Issue 4, Pages: 69-78(2026)
- 作者机构：
  
  1. 东南大学能源与环境学院,江苏,南京,210096
  2. 东南大学材料科学与工程学院,江苏,南京,210096
  3. 中国核动力研究设计院,四川,成都,610213
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.240801
  CLC： TL333
- Published：2026
- 稿件说明：
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何丽芬, 黄军林, 朱小良, 韩斌, 王斐菲, 郭建伟, 涂益友, 徐青蓝. PbO污垢层对铅铋堆绕丝燃料组件稳态传热特性的影响研究[J]. 动力工程学报, 2026, 46(4): 69-78.
何丽芬, 黄军林, 朱小良, 韩斌, 王斐菲, 郭建伟, 涂益友, 徐青蓝. PbO污垢层对铅铋堆绕丝燃料组件稳态传热特性的影响研究[J]. 动力工程学报, 2026, 46(4): 69-78. DOI： 10.19805/j.cnki.jcspe.2026.240801.

DOI： 10.19805/j.cnki.jcspe.2026.240801

摘要

为研究表面污垢沉积对铅铋堆绕丝燃料组件热工水力性能的影响

建立表面均匀覆盖氧化铅(PbO)污垢层的19棒束绕丝燃料组件稳态传热数值模型

考虑铅铋与燃料包壳、绕丝和污垢层之间的流固共轭换热

分析污垢层厚度、铅铋质量流量和总加热功率对燃料组件温度场和流场的影响

获得了组件内铅铋温度和流速分布、燃料包壳壁温变化规律。结果表明:表面覆盖较薄(≤40 μm)的PbO污垢层对燃料组件整体传热系数的影响较小

但会致使包壳温度升高;PbO污垢层厚度增加

组件包壳外壁面周向最大温度轴向分布均匀

截面周向温度呈现非线性变化;增大铅铋流量、减小加热功率

结垢包壳外壁面最大温度的温升幅度降低;污垢层厚度增加

边界条件对包壳温度的影响增大;相较于表面均匀覆盖污垢层的情况

由垢物沉积、部件脱落等所引发的局部堵塞会导致包壳的局部温度骤增

应避免发生此种情况。

Abstract

To investigate the effects of surface fouling on thermal-hydraulic performance of wire-wrapped fuel assemblies in lead-bismuth cooled reactors

a steady-state numerical model was developed for a 19-rod bundle with uniform lead oxide (PbO) deposits. Considering the fluid-solid conjugate heat transfer between lead-bismuth and fuel cladding

wire-wrapped and fouling layer

the effects of fouling layer thickness

lead-bismuth mass flow rate and total heating power on temperature and flow fields of the fuel assembly were analyzed. And then the distributions of lead-bismuth temperature and flow velocity in the assembly and the variation of fuel cladding wall temperature were obtained. Results show that PbO fouling layer with a thinner surface coverage(≤40 μm)has little effect on the overall heat transfer coefficient of the fuel assembly

but it will cause the cladding temperature to rise. Increasing fouling thickness produces uniform axial distribution of maximum circumferential temperature on the assembly cladding outer wall while inducing nonlinear circumferential variations across sections. After increasing lead-bismuth flow rate and reducing heating power

the maximum temperature rise of fouling cladding outer wall decreases. Meanwhile

the influence of boundary conditions on cladding temperature intensifies with increasing fouling thickness. Compared with the case where the surface is uniformly covered fouling layer

local blockage caused by fouling deposition and component shedding will lead to a sudden increase in the local temperature of the cladding

which should be avoided.

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references

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