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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。
Most of the supercritical water-cooled reactor fuel assemblies are arranged in a dense grid with wire wrapping. Wire wrapping can enhance the mixing ability between channels and have a significant impact on the heat exchange characteristics of the channel. In this paper, a 2 × 2 element with a small bundle of filaments was taken as the analysis object. The CFD method was used to analyze the influence of the filaments on the heat transfer characteristics under supercritical conditions. The analysis results show that the wire winding can improve the heat exchange capacity of the channel and restrain the uneven distribution in the circumferential direction, but it may also generate the peak value of the wall temperature locally. There are two types of causes for the peak value of wall temperature found in the numerical calculation. The causes of the two are further described, and the influence of structure parameters on the heat transfer characteristics is analyzed.