Abstract The paper reviews the transverse curvature effect on the friction force on and the leading-edge flow around a cylinder subjected to axial flow. Skin friction coefficient (Cf) on the cylinder surface could be predominant functions of Reynolds number (Rea, based on cylinder radius a), transverse curvature (a+, normalized by friction velocity Uτ), and boundary-layer thickness ratio (δ/a). The relationships between Cf, Rea, a+, and δ/a are analyzed, established, and presented in the form of empirical formulations. The Cf at Rea ≤ 2 × 103 is mainly dependent on δ/a while that at Rea > 2 × 103 is largely contingent on Rea. The gaps of research into the axial flow cylinder are pointed out, namely, the literature lack the experimental study on large transverse curvature (small a+).

中文翻译：

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横向曲率对摩擦力和前缘流动的影响综述

摘要 本文综述了横向曲率对轴流作用下圆柱体上摩擦力和前缘流动的影响。圆柱表面上的皮肤摩擦系数 (Cf) 可能是雷诺数 (Rea，基于圆柱半径 a)、横向曲率 (a+，由摩擦速度 Uτ 归一化) 和边界层厚度比 (δ/a) 的主要函数. 分析、建立并以经验公式的形式呈现 Cf、Rea、a+ 和 δ/a 之间的关系。Rea ≤ 2 × 103 处的 Cf 主要取决于 δ/a，而 Rea > 2 × 103 处的 Cf 主要取决于 Rea。指出了轴流圆柱体研究的不足，即文献缺乏大横向曲率（小a+）的实验研究。