弯曲截面轮廓肋条在绕过有限长度物体的边界层中的局部性能
Localized performance of riblets with curved cross-sectional profiles in boundary layers past finite length bodies
AI总结：
本文利用高分辨率PIV实验研究有限尺寸水翼上弯曲截面肋条的局部减阻机制，发现其可同时降低摩擦与压差阻力，累积减阻最高达6%。
摘要：
肋条（riblets）是一种众所周知的被动减阻技术，在实验室环境中具有使摩擦阻力降低多达9%的潜力，并且已被证明对大型飞机有益。然而，关于这些纹理在较小型空中/水下载具上的适用性，可用信息较少；在这些载具上，边界层的周期性和/或渐近性质等假设不再成立，而且这些载具的物体形状可能产生中等程度的压差阻力。在此，我们研究肋条对有限尺寸水翼两侧的影响，该水翼由流线型前缘和平直主体组成。我们采用高分辨率二维、二分量粒子图像测速技术，并结合双重照明和连续重叠成像方法，以捕捉边界层和远场中的速度场。我们获得了局部速度剖面和剪切应力分布，以及阻力的摩擦分量和压力分量，并展示了同时降低阻力的摩擦分量和压力分量的可能性，记录到高达6%的累积减阻。我们呈现了展向平均剪切应力分布、速度剖面特征以及物体周围压力分布之间相互交织的关系，并说明了这些参数的局部分布如何相互协同或相互抵消，从而在整个所研究物体上增强或削弱肋条的减阻能力。
英文摘要：
Riblets are a well-known passive drag reduction technique with the potential for as much as 9% reduction in the frictional drag force in laboratory settings, and proven benefits for large scale aircraft. However, less information is available on the applicability of these textures for smaller air/waterborne vehicles where assumptions such as periodicity and/or asymptotic nature of the boundary layer no longer apply and the shape of the bodies of these vehicles can give rise to moderate levels of pressure drag. Here, we explore the effect of riblets on both sides of a finite-size foil consisting of a streamlined leading edge and a flat body. We use high resolution two-dimensional, two-component particle image velocimetry, with a double illumination and consecutive-overlapping imaging technique to capture the velocity field in both the boundary layer and the far field. We find the local velocity profiles and shear stress distribution, as well as the frictional and pressure components of the drag force and show the possibility of achieving reduction in both the fictional and pressure components of the drag force and record cumulative drag reduction as much as 6%. We present the intertwined relationship between the distribution of the spanwise-averaged shear stress distribution, the characteristics of the velocity profiles, and the pressure distribution around the body, and how the local distribution of these parameters work together or against each other in enhancing or diminishing the drag-reducing ability of the riblets for the entirety of the body of interest.
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