An Investigation of Vortex Flows over Low Sweep Delta Wings
An Investigation of Vortex Flows over Low Sweep Delta Wings
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DOI：
10.2514/6.2003-4021
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发表时间：
2003-06
期刊：
影响因子：
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通讯作者：
G. Taylor;T. Schnorbus;I. Gursul
中科院分区：
文献类型：
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作者：
G. Taylor;T. Schnorbus;I. Gursul
本文介绍了对前缘后掠为Λ = 50°的非细长三角翼上涡结构的最新研究结果。水洞实验中的流动可视化研究表明，涡结构对雷诺数非常敏感。随着雷诺数的减小，涡核的轨迹向机翼中心线内侧移动，破裂的开始明显延迟。结果提供了在以前的计算研究中观察到的双涡结构的第一个实验证据。这些双涡的形成对雷诺数也很敏感，并且在所考虑的数值的非常低端没有观察到其形成。数字粒子图像测速仪（DPIV）测量的横流产生轴向涡量数据在一些流向站和发病率。在小迎角时，只观察到一个很弱的涡结构，在很靠近机翼表面处形成一个很强的剪切层。随着冲角的增加，剪切层从表面上抬起，但仍观察到再附着。发病率的增加也导致再附着线向模型中心线移动，直到最终再附着失败。
This paper presents the results of a recent investigation into the vortex structure over a nonslender delta wing with leading edge sweep, Λ = 50°. A flow visualisation study in water tunnel experiments has shown profound sensitivity of the vortex structure to Reynolds number. As Reynolds number was reduced, the trajectory of the vortex core moved inboard toward the wing centre-line, and the onset of breakdown was noticeably delayed. The results provide the first experimental evidence of the dual vortex structure that has been observed in previous computational studies. The formation of these dual vortices was also sensitive to Reynolds number, and its formation was not observed at the very low end of values considered. Digital Particle Image Velocimetry (DPIV) measurements of the cross-flow have yielded axial vorticity data at a number of streamwise stations and incidences. At low incidences only a very weak vortex structure was observed with a strong shear layer forming very close to the wing surface. As incidence was increased the shear layer lifted from the surface but reattachment was still observed. Increasing incidence also resulted in a movement of the reattachment line towards the model centre-line, until ultimately reattachment failed.