A large number of studies of flow visualisations, developed on the upper surface of delta and of gothic wings, and of cones, have been carried out in the wind tunnel of the Valenciennes University’s Aerodynamics and Hydrodynamics Laboratory. These studies have provided a better understanding of the development and of the positioning of vortex structures and have enabled, in particular, the preferential nature of intervortex angles, thereby defined, to be determined. This study of the vortical structures developed on the upper surface of a double-delta wing has revealed that these vortex flows are quite complex and that vortex structures interact with one another. Indeed, it would seem that vortex behaviour has something of a universal nature. An angular conformity between primary and secondary vortex torques and the leading edges of the wing can be expressed by the law of filiation. Intervortex angles evolve with increasing incidence while fragmentation is a function of the apex angle. It would be interesting to recall that this particular spatial organisation of vortex structures, citing the concept of preferential angles, also appears in standard theories on aerodynamics as, for example, in those governing aerodynamic drag. Nevertheless, the link between interior and exterior vortex structures remains to be investigated further. Such studies might even prove the existence of a supplementary torque. In addition, the least resistance of secondary vortices in relation to their fragmentation inevitably calls for experiments to be undertaken with other possible combinations of slender bodies Abene, J Aeronaut Aerospace Eng 2013, 2:4 DOI: 10.4172/2168-9792.1000118 although these areas of research are beyond the scope of this article.
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机译：在瓦伦西安大学空气动力学和流体力学实验室的风洞中，进行了许多关于在三角洲，哥特式机翼和圆锥体上表面进行流动可视化的研究。这些研究提供了对涡旋结构的发展和位置的更好的理解，并且尤其使得能够确定由此定义的涡旋角的优先性质。对双三角翼上表面形成的旋涡结构的这项研究表明，这些旋涡流非常复杂，并且旋涡结构彼此相互作用。确实，涡旋行为似乎具有普遍性。初级涡旋转矩和次级涡旋转矩与机翼前缘之间的角度一致性可以通过丝线定律表达。涡旋角随入射角的增加而演化，而破碎是顶角的函数。有趣的是，涡流结构的这种特殊的空间组织，以优先角度的概念为例，也出现在空气动力学的标准理论中，例如，在控制空气动力学阻力的理论中。尽管如此，内部和外部涡旋结构之间的联系仍有待进一步研究。这样的研究甚至可能证明存在补充扭矩。此外，次级涡流相对于其破碎的最小阻力不可避免地要求对细长体的其他可能组合进行实验Abene，J Aeronaut Aerospace Eng 2013，2：4 DOI：10.4172 / 2168-9792.1000118研究超出了本文的范围。
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