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Free-stream turbulence interaction with a wing-tip vortex
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jweia.2020.104211
Kamal Ben Miloud , Marouen Dghim , Hachimi Fellouah , Mohsen Ferchichi

Abstract The interaction of a wing-tip vortex of a rectangular, square-tipped wing having a NACA 0012 airfoil section with a grid-generated turbulent flow was investigated in this paper. The experiments were conducted in the near and mid-wake regions at three free stream turbulence (FST) intensities of 0.5%, 3% and 6%, and at two Reynolds numbers, Re, based on the wing chord length, c w , of 2 × 10 5 and 3 × 10 5 . Stereoscopic Particle Image Velocimetry (SPIV) and hot-wire measurements were carried out at four downstream positions, namely x / c w = 1.25 , 3.25 , 6.25 and 7.75. Streamwise velocity contours showed that the wing-tip vortex decayed with increased FST and downstream distance. In the vortex core region, the streamwise velocity decelerated while the vortex adopted a wake-like profile. FST was found to decrease the vortex circulation and to increase the vortex radius and vortex meandering amplitude. When increasing Reynolds number, the grid cases showed little variation of the vortex radius and peak vorticity levels, particularly at larger downstream positions, suggesting that the effects of FST and R e number on the vortex development are nearly independent. The measured total turbulent kinetic energy (TKE) was found to be mostly due to vortex meandering. In that, total TKE levels devoid of meandering showed a virtually turbulence-free vortex core.

中文翻译:

自由流湍流与翼尖涡流相互作用

摘要 本文研究了具有 NACA 0012 翼型截面的矩形、方形尖端机翼的翼尖涡与网格产生的湍流的相互作用。实验是在近尾流和中尾流区域以 0.5%、3% 和 6% 的三个自由流湍流 (FST) 强度以及两个雷诺数 Re(基于翼弦长 cw 为 2)进行的× 10 5 和3 × 10 5 。立体粒子图像测速 (SPIV) 和热线测量在四个下游位置进行,即 x/cw = 1.25、3.25、6.25 和 7.75。流向速度等值线表明翼尖涡随着 FST 和下游距离的增加而衰减。在涡核区域,流向速度减慢,而涡流采用尾流轮廓。发现 FST 会减少涡流环流并增加涡流半径和涡流曲折幅度。当雷诺数增加时,网格情况下涡半径和峰值涡度水平几乎没有变化,特别是在较大的下游位置,表明 FST 和 R e 数对涡发展的影响几乎是独立的。发现测量的总湍流动能 (TKE) 主要是由于涡流曲折。在这方面,没有曲折的总 TKE 水平显示出几乎无湍流的涡核。表明 FST 和 Re 数对涡流发展的影响几乎是独立的。发现测量的总湍流动能 (TKE) 主要是由于涡流曲折。在这方面,没有曲折的总 TKE 水平显示出几乎无湍流的涡核。表明 FST 和 Re 数对涡流发展的影响几乎是独立的。发现测量的总湍流动能 (TKE) 主要是由于涡流曲折。在这方面,没有曲折的总 TKE 水平显示出几乎无湍流的涡核。
更新日期:2020-11-01
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