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本文介绍不同曲率半径和不同粗糙度时反弧段紊流边界层的研究成果．导出反弧段的摩阻计算公式，并计算了反弧段摩阻流速及壁画切应力等，发现在反弧末端，壁面切应力明显增大，对粗糙度变化反应敏感．
In this paper, the research results of the turbulent boundary layer in the anti-arc section with different radii of curvature and different roughness are introduced. The formula for calculating the friction of the anti-arc segment is deduced. The friction velocities of the anti-arc segment and the shear stress of the mural arc are calculated. It is found that at the end of the anti-arc, the shear stress of the wall increases obviously and is sensitive to the variation of the roughness.