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复杂通道是介于典型通道和典型栅元之间的几何结构,在通道形状、加热方式等方面更接近于原型组件。本文以小棒束2×2结构为分析对象,采用计算流体力学(CFD)工具分析组件内的温场特征,并讨论热流密度、质量流速等热工参数对通道平均换热系数的影响。结果表明,减小热流密度、增加质量流速都会增强换热。棒束结构的壁面温度分布存在明显的周向不均匀性,固体壁面导热会有效抑制这种周向不均匀性,进而增强通道的换热能力。
Complex channels are the geometry between the typical channel and the typical cell, closer to the prototype component in terms of channel shape, heating pattern, and the like. In this paper, the 2 × 2 structure of the small rod bundle is taken as the analysis object. The CFD tool is used to analyze the characteristics of the temperature field and the influence of the thermal parameters such as heat flux and mass flow velocity on the average heat transfer coefficient of the channel. The results show that reducing heat flux and increasing mass flow rate enhance heat transfer. The wall temperature distribution of the bundle structure has obvious circumferential inhomogeneity. The solid wall heat conduction can effectively restrain the circumferential unevenness and enhance the heat transfer capacity of the channel.