Leading-edge vortex dynamics on plunging airfoils and wings
Leading-edge vortex dynamics on plunging airfoils and wings
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DOI：
10.1017/jfm.2022.224
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发表时间：
2022-04
影响因子：
3.7
通讯作者：
O. Son;Anthony Gao;I. Gursul;C. Cantwell;Z. Wang;S. Sherwin
中科院分区：
文献类型：
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作者：
O. Son;Anthony Gao;I. Gursul;C. Cantwell;Z. Wang;S. Sherwin
摘要为了了解前缘涡丝的变形和展向不稳定性，通过体积速度测量、数值模拟和稳定性分析，研究了大展弦比（AR = 10）机翼和翼型上前缘涡的涡动力学特性。机翼和翼型上的涡丝都呈现展向波，但起源不同。翼尖的存在使涡腿保持附着在机翼上表面，而翼尖附近的细丝的初始变形类似于螺旋涡。基本特征可以模拟为初始L形半无限涡柱的变形。相反，涡的不稳定性被反向旋转涡对的不稳定性很好地捕获，反向旋转涡对由后缘涡或从机翼表面卷起的二次涡形成。在实验和模拟中观察到的波长与不等强度反向旋转涡对的稳定性分析一致。
Abstract The vortex dynamics of leading-edge vortices on plunging high-aspect-ratio (AR = 10) wings and airfoils were investigated by means of volumetric velocity measurements, numerical simulations and stability analysis to understand the deformation of the leading-edge vortex filament and spanwise instabilities. The vortex filaments on both the wing and airfoil exhibit spanwise waves, but with different origins. The presence of a wing-tip causes the leg of the vortex to remain attached to the wing upper surface, while the initial deformation of the filament near the wing tip resembles a helical vortex. The essential features can be modelled as the deformation of an initially L-shaped semi-infinite vortex column. In contrast, the instability of the vortices is well captured by the instability of counter-rotating vortex pairs, which are formed either by the trailing-edge vortices or the secondary vortices rolled-up from the wing surface. The wavelengths observed in the experiments and simulations are in agreement with the stability analysis of counter-rotating vortex pairs of unequal strength.