液态铅铋合金在绕丝燃料棒组件子通道间湍流交混数值模拟

王婧婕; 朱大欢; 卢涛; 邓坚; 蔡容

doi:10.13832/j.jnpe.2021.05.0030

液态铅铋合金在绕丝燃料棒组件子通道间湍流交混数值模拟

doi: 10.13832/j.jnpe.2021.05.0030

王婧婕^1,,
朱大欢²,
卢涛^1, ,,
邓坚²,
蔡容²

1.
北京化工大学机电工程学院，北京，100029
2.
中国核动力研究设计院核反应堆系统设计技术重点实验室，成都，610213

详细信息

作者简介:
王婧婕（1996—），女，硕士研究生，现从事核反应堆热工水力研究，E-mail: 18811589233@163.com

通讯作者:
卢涛，E-mail: likesurge@sina.com

中图分类号: TK124
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出版历程
- 收稿日期: 2020-09-03
- 修回日期: 2021-05-21
- 刊出日期: 2021-09-30

Numerical Simulation of Turbulent Mixing of LBE between Sub-Channels of Wire-Wrapped Fuel Assembly

Wang Jingjie^1
,,
Zhu Dahuan²,
Lu Tao^{1
, ,},
Deng Jian²,
Cai Rong²

1.
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing,100029, China
2.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 液态铅铋合金（LBE）是第四代液态金属核反应堆候选冷却剂，由于LBE热物性具有一定的特殊性，亟待对LBE在燃料组件子通道中的流动与传热过程开展研究。本文对LBE在带绕丝燃料棒组件中湍流流动进行数值模拟与分析，将燃料棒壁面温度的数值模拟结果与响应的实验数据相比较，2者具有较高的吻合度，说明数学模型及数值结果具有较高的可靠性与准确性；使用湍流交混系数β表征LBE在不同子通道间、不同燃料棒间隙宽度与燃料棒直径比（S/D）结构下的湍流交混情况，结果表明，不同子通道间β波动程度具有差异性，β的大小与S/D呈负相关。基于不同S/D与雷诺数的计算结果，拟合出不同子通道间β关联式，为绕丝燃料棒三角形排列方式的燃料组件子通道分析程序开发提供交混模型。
- 液态铅铋合金（LBE） /
- 湍流交混 /
- 绕丝燃料棒组件 /
- 子通道分析
Abstract: The lead-bismuth eutectic (LBE) is a candidate coolant for the fourth generation liquid metal reactors. In view of its special thermophysical properties, its flow and heat transfer process in the fuel assembly sub-channels need to be studied. For this purpose, the authors conduct numerical simulation and analysis of the turbulent flow of the LBE in the wire-wrapped fuel assembly, and compare the numerical simulation results of the wall temperature of fuel rods with the experimental data for response. The simulation results agree well with the experimental data, indicating that the mathematical model and numerical results are highly reliable and accurate. The authors also characterize the turbulent mixing of LBE between different sub-channels at different values of the ratio of spacing between fuel rods to the fuel rod diameter (S/D), using the turbulent mixing coefficient β. The characterization results show that the fluctuation of β between different sub-channels varies and that the β value is negatively correlated with the S/D. Based on different calculation results of the S/D and Renolyd number, the correlation formula for the β between different sub-channels is obtained by fit. It provides a turbulent mixing model for the development of a sub-channel analysis code of fuel assembly consisting of wire-wrapped fuel rods arranged in triangular form.
- LBE /
- Turbulent mixing /
- Wire-wrapped fuel assembly /
- Sub-channel analysis

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图 1 几何模型

S—燃料棒间隙宽度；P—燃料棒中心距；D—燃料棒直径；E—燃料组件壁面对边距；H—绕丝螺距；d—绕丝直径

Figure 1. Geometric Model

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图 2 LBE横向速度分布矢量图

Figure 2. Vector Diagram of LBE Transverse Velocity Distribution　　　　

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图 3 不同子通道间β分布

Figure 3. Distribution of β between Different Sub-Channels

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图 4 不同S/D下子通道间β分布

Figure 4. Distribution of β between Sub-Channels at Different S/D Values

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图 5 各子通道β

Figure 5. β for Different Sub-Channels

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表 1 燃料组件几何参数

Table 1. Geometric Parameters of Fuel Assembly

参数名	参数值
燃料棒排列方式	三角形栅格排列
燃料棒根数	7
燃料棒直径/mm	8.2
燃料棒中心距/mm	10.49
燃料棒间隙宽度/mm	2.29
燃料棒长度/mm	870
绕丝直径/mm	2.2
绕丝螺距/mm	328
燃料组件壁面对边距/mm	31.6

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表 2 燃料棒壁面温度与子通道LBE温度的计算结果与实验结果对比

Table 2. Comparison of Calculation and Experimental Results of Fuel Rod Wall Surface Temperature and LBE Temperature in Sub-Channels

z=0.0546 m	燃料棒（实验）序号	燃料棒（CFD）序号	实验值/℃	CFD结果/℃	误差/%
	1	1	221.2	213.8	−3.34
	8	2	219.8	218.0	−0.80
	10	3	217.2	216.0	−3.68
	14	5	222.5	216.2	−2.82
	18	7	216.1	214.7	−0.66
	子通道（实验）序号	子通道（CFD）序号	实验值/℃	CFD结果/℃	误差/%
	1	1	204.7	203.1	−0.81
	25	7	206.1	200.9	−2.50
	37	13	201.7	200.3	−0.71

z=0.6013 m	燃料棒（实验）序号	燃料棒（CFD）序号	实验值/℃	CFD结果/℃	误差/%
	1	1	295.2	278.1	−5.79
	10	3	268.3	239.2	−10.86
	14	5	264.7	245.3	−7.32
	16	6	261.2	255.5	−6.09
	18	7	278.3	274.1	−1.51
	子通道（实验）序号	子通道（CFD）序号	实验值/℃	CFD结果/℃	误差/%
	5	5	272.2	263.9	−3.04
	33	11	254.4	236.7	−6.56
	41	17	238.0	223.5	−6.1

z=0.8200 m	燃料棒（实验）序号	燃料棒（CFD）序号	实验值/℃	CFD结果/℃	误差/%
	1	1	318.0	291.4	−8.35
	10	3	287.5	258.1	−10.21
	12	4	280.6	263.5	−6.11
	14	5	295.1	291.8	−1.12
	18	7	287.8	265.4	−7.77
	子通道（实验）序号	子通道（CFD）序号	实验值/℃	CFD结果/℃	误差/%
	3	3	298.1	277.4	−6.93
	29	9	275.4	248.7	−9.71
	39	15	259.9	233.5	−10.14

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