Vortical Substructures in the Shear Layers Forming Leading-Edge Vortices
Vortical Substructures in the Shear Layers Forming Leading-Edge Vortices
复制标题
剪切层中的涡旋子结构形成前缘涡旋
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
P. Molton
中科院分区：
文献类型：
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作者：
A. Mitchell;P. Molton
在大迎角时，尖缘、细长、三角翼上前缘涡破裂的控制在很大程度上取决于对这种现象的基本特性的了解和探测或观察这种现象的能力。大量的理论、实验和数值研究集中在前缘涡和涡破裂的特性上。然而，有限的努力试图了解的分离剪切层卷起形成的前缘涡。人们对涡量在涡破裂现象中的作用越来越感兴趣，实验测量技术的最新进展使人们能够对涡流场和分离剪切层进行更详细的分析。本文研究三角翼前缘涡形成的剪切分离层中的涡子结构。在ONERA亚音速风洞中，对一个后掠角为70°、根部弦长为950 mm的尖缘三角翼模型绕流场进行了三维激光多普勒测速测量，测量的弦基雷诺数为1.56 × 10 ~ 6。结果提供了这些涡的结构和路径的前缘涡核周围的亚结构的描述。此外，获得的信息的结构和路径的涡子结构的影响下，沿核心吹这是用来操纵涡破裂位置。这项研究是下一步更好地了解子结构的起源及其对前缘涡和涡破裂的影响。
Control of leading-edge vortex breakdown over sharpedged, slender, delta wings at high angles of attack is highly dependent on the knowledge of and the ability to detect or observe the principle characteristics of the phenomenon. Substantial theoretical, experimental and numerical research has focused on the characteristics of leading-edge vortices and vortex breakdown. However limited efforts have sought to understand the separating shear layers which roll up to form the leading-edge vortices. Increased interest in the role of vorticity in the vortex breakdown phenomena and recent advances in experimental measurement techniques have enabled more detailed analysis of the vortical flow field and the separating shear layer. The objective of this study is to characterize the vortical substructures in the separating shear layers forming the leading-edge vortices around a delta wing. Threedimensional Laser Doppler Velocimetry flow field measurements are realized in an ONERA subsonic wind tunnel around a sharp-edged, delta wing model with a 70°sweep angle and a root chord of 950mm at a chord based Reynolds number of 1.56xl0 6. The results provide a description of the structure and path of these vortical substructures around the leading-edge vortex cores. Additionally, information is obtained on the structure and path of the vortical substructures under the influence of along-the-core blowing which is used to manipulate the vortex breakdown location. This research is the next step towards a better understanding of the origin of the substructures and their influence on the leading-edge vortices and vortex breakdown.