旋向对螺旋管束内铅铋流动传热特性影响的数值模拟研究

沈聪; 刘茂龙; 程坤; 刘利民; 徐子伊; 顾汉洋

doi:10.13832/j.jnpe.2023.S1.0057

旋向对螺旋管束内铅铋流动传热特性影响的数值模拟研究

doi: 10.13832/j.jnpe.2023.S1.0057

1.
上海交通大学核科学与工程学院，上海，200240
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

基金项目: 国家自然科学基金 (12005215)

详细信息

作者简介:
沈　聪（1996—），男，博士研究生，现主要从事铅铋螺旋管安全和优化方面的研究，E-mail: cheneysc@sjtu.edu.cn

中图分类号: TL333
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- 被引次数: 0
出版历程
- 收稿日期: 2022-12-02
- 修回日期: 2023-05-08
- 刊出日期: 2023-06-15

Numerical Investigation of LBE Flow and Heat Transfer Characteristics in Helical-coiled Tube Bundles with Different Coil Strategies

1.
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
2.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: 螺旋管式直流蒸汽发生器（H-OTSG）被广泛应用于液态金属反应堆的设计中，其中相邻的径向螺旋管束可以布置为同一旋向或相反旋向，不同的旋向策略会影响到蒸汽发生器壳侧的流动行为。为探究不同旋向对螺旋管束中铅铋流动与传热特性的影响，采用剪切应力输运（SST k-ω）模型、湍流模型和Kays湍流普朗特数（Pr_t）模型对其进行数值模拟研究。首先通过现有液态金属横掠棒束实验对数值方法进行了验证；其次建立了同一旋向和交替旋向2种螺旋管束模型，比较了其传热和阻力的差异；最后从流场的角度对产生差异的原因进行了分析。结果表明，交替旋向的螺旋管束中的阻力和传热分别比同一旋向管束高7.1%和4.4%，这是因为交替旋向管束中的速度场更均匀且湍流交混更强。
- 螺旋管式直流蒸汽发生器(H-OTSG) /
- 铅铋 /
- 旋向策略 /
- 数值模拟
Abstract: Helical tube once-through steam generators (H-OTSG) are widely used in the design of liquid metal reactors, in which adjacent radial tube bundles can be coiled in the same direction or opposite direction, and different coil strategies will affect the flow behavior on the shell side of the steam generator. To explore the lead-bismuth eutectic (LBE) flow and heat transfer characteristics in helical tube bundles with different coil strategies, the shear stress transport (SST k-ω) model, turbulence model and Kays turbulent Prandtl number (Pr_t) model are used for numerical simulation. First, the numerical method is validated by existing experiments of liquid metal flow cross tube banks. Then, helical-coiled tube bundles with the same coiling direction and alternate coiling direction are established, and the differences in heat transfer and flow resistance are compared. Finally, the reason for the differences is analyzed from the perspective of the flow field. The results show that the flow resistance and heat transfer in the helical-coiled tube bundle with alternate coiling direction are 7.1% and 4.4% higher than those with the same coiling direction respectively. This is due to the stronger turbulent mixing and more uniform velocity field in the alternate-coiled bundle.
- Helical tube once-through steam generator (H-OTSG) /
- Lead-bismuth eutectic /
- Coiling direction /
- Numerical simulation

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图 1 计算域几何模型

Figure 1. Geometry Information of Simulation Domain

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图 2 Kalish实验段和计算域示意图

1~4—不同边界条件的编号与标识

Figure 2. Schematic Diagram of Kalish Experiment Section and Calculated Fluid Domain

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图 3 Nu模拟预测偏差

Figure 3. Simulation Deviations of Nusselt Number

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图 4 实验与计算阻力系数比较

Figure 4. Comparison of Experimental and Calculated Friction Factors

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图 5 局部网格划分

Figure 5. Local Grid Distribution

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图 6 不同旋向策略下f随Re的变化

Figure 6. f VS. Re under Different Coiling Directions

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图 7 不同旋向策略下Nu随Pe的变化

Figure 7. Nu VS. Pe under Different Coiling Directions

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图 8 不同旋向螺旋管束中的流场

Figure 8. Flow Fields under Different Coiling Directions

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表 1 不同网格划分下的换热系数和压降

Table 1. h and Δp under Different Grid Strategies

网格数量/个 0.83×10⁶ 2.77×10⁶ 4.62×10⁶

h/[W·(m²·K)⁻¹] 35963.63 37174.86 37082.44
Δp/Pa 3950.28 4124.75 4193.61

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参考文献(14)

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