Purpose

Since the inception of aerospace engineering, reducing drag is of eternal importance. Over the years, researchers have been trying to improve the aerodynamics of National Advisory Committee for Aeronautics (NACA) aerofoils in many ways. It is proved that smooth-surfaced NACA 0012 aerofoil produces more drag in compressible flow. Recent research on shark-skin pattern warrants a feasible solution to many fluid-engineering problems. Several attempts were made by many researchers to implement the idea of shark skin in the form of coatings, texture and more. However, those ideas are at greater risk when it comes to wing maintenance. The purpose of this paper is to implement a relatively larger biomimetic pattern which would make way for easy maintenance of patterned wings with improved performance.

Design/methodology/approach

In this paper, two biomimetic aerofoils are designed by optimizing the surface pattern of shark skin and are tested at different angles of attack in the computational flow domain.

Findings

The results of the biomimetic aerofoils prove that viscous and total drag can be reduced up to 33.08% and 3.68%, respectively, at high subsonic speed when validated against a NACA 0012 aerofoil. With the ample effectiveness of patched shark-skin pattern, biomimetic aerofoil generates as high as 10.42% lift than NACA 0012.

Originality/value

In this study, a feasible shark-skin pattern is constructed for NACA 0012 in a transonic flow regime. Computational results achieved using the theoretical model agree with experimental data.

中文翻译：

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增强机翼表面可压缩流动的计算分析

目的

自航空航天工程诞生以来，减少阻力就具有永恒的重要性。多年来，研究人员一直在尝试以多种方式改善国家航空咨询委员会 (NACA) 机翼的空气动力学性能。事实证明，表面光滑的 NACA 0012 翼型在可压缩流中产生更大的阻力。最近对鲨鱼皮图案的研究为许多流体工程问题提供了可行的解决方案。许多研究人员进行了多次尝试，以通过涂层、纹理等形式实现鲨鱼皮的想法。然而，在机翼维护方面，这些想法面临更大的风险。本文的目的是实现一个相对较大的仿生图案，这将为易于维护具有改进性能的图案翅膀铺平道路。

设计/方法/方法

在本文中，通过优化鲨鱼皮的表面图案设计了两种仿生翼型，并在计算流域中以不同的攻角进行了测试。

发现

仿生翼型的结果证明，当针对 NACA 0012 翼型进行验证时，在高亚音速下，粘性阻力和总阻力可以分别降低 33.08% 和 3.68%。凭借修补鲨鱼皮图案的强大功效，仿生机翼产生的升力比 NACA 0012 高 10.42%。

原创性/价值

在这项研究中，为 NACA 0012 在跨音速流动状态中构建了一种可行的鲨鱼皮模式。使用理论模型获得的计算结果与实验数据一致。