Abstract The flow topology, heat transfer, and forces are numerically studied for a cylinder with its cross-section varied from square to circular by changing the cylinder corner radius ratio r/R = 0–1.0, where r is the corner radius and R is the half side width of the cylinder. The flow attack angle α is varied from 0° to 45°. The dependence of the flow on r/R and α leads to four flow patterns (A, B, C, and D). The effect of α on heat transfer and forces is large when r/R is small. The r/R largely affects the heat transfer at α 10°. The heat transfer for a given r/R enhances with increasing α. It is minimum at α = 0°, r/R = 0 and maximum at α = 45°, r/R = 0.5, with the maximum being 37% more than the minimum. The sensitiveness of heat transfer and forces to r/R and α is ascribed to the change in the boundary layer, side-surface bubble, primary wake bubble, and secondary wake bubble. The boundary layer largely contributes to the heat transfer while the primary wake bubble is largely connected to the forces. The vortex formation length is inversely linked to heat transfer and forces, with the heat transfer more influenced by the formation length than by the wake width.

中文翻译：

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圆柱角半径和攻角对传热和流动拓扑的影响

摘要 通过改变圆柱角半径比 r/R = 0–1.0，对横截面从方形变为圆形的圆柱体进行流动拓扑、传热和力的数值研究，其中 r 是拐角半径，R 是圆柱体的半边宽。流动攻角α从0°到45°变化。流量对 r/R 和 α 的依赖性导致四种流动模式（A、B、C 和 D）。当 r/R 小时，α 对传热和力的影响很大。r/R 很大程度上影响 α 10° 处的传热。给定 r/R 的传热随着 α 的增加而增强。它在 α = 0°、r/R = 0 处最小，在 α = 45°、r/R = 0.5 处最大，最大值比最小值高 37%。传热和力对 r/R 和 α 的敏感性归因于边界层、侧表面气泡、初级尾流泡沫和次级尾流泡沫。边界层在很大程度上有助于传热，而主尾流气泡在很大程度上与力有关。涡流形成长度与热传递和力成反比，热传递受地层长度的影响比尾流宽度的影响更大。