含绕丝2&#215;2棒束内超临界水传热特性数值研究

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含绕丝2×2棒束内超临界水传热特性数值研究

1. CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China;
2. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China

摘要: 超临界水冷堆燃料组件多采用稠密栅格布置,用绕丝进行定位,绕丝可增强通道间的交混能力,对通道的换热特征会产生明显影响。以含绕丝的小棒束2×2组件为分析对象,采用计算流体动力学(CFD)方法分析超临界条件下绕丝对换热特征的影响。分析结果表明:绕丝会改善通道的换热能力,抑制周向不均匀分布,但也可能在局部产生壁温峰值。在数值计算中发现壁温峰值的成因有两类,并对二者的成因进一步叙述,分析绕丝结构参数对换热特性的影响。
- 2× /
- 2棒束 /
- 绕丝 /
- 壁温峰值 /
- 传热特性
Abstract: The SCWR assembly always adopts the tight lattice configure with the wire wrap to fix up. The wire wrap will contribute the turbulent mixing in different subchannels and have big impact on the heat transfer characteristics in the rod bundles. This paper took the small wire-wrap 2×2 rod bundles as the analysis object and investigated the heat transfer phenomena with the CFD tools. It was found that the wire wrap will enhance the heat transfer capability and impair the non uniformity of wall temperature. However, it could also bring about the local wall peak temperature which could be classified into two reasons. The impact of wire wrap structure parameter on heat transfer was also explained.
- 2× /
- 2 rod bundle /
- Wire wrap /
- Peak wall temperature /
- Heat transfer characteristics