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首页> 外文期刊>International Journal of Aerodynamics >Visualisation of wingtip vortices produced by a wing near a stationary ground plane
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Visualisation of wingtip vortices produced by a wing near a stationary ground plane

机译：可视化由机翼在固定地面附近产生的翼尖旋涡

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摘要

When a lifting body produces wingtip vortices near a surface, the lateral movement of these vortices as they travel downstream can differ from that seen in free flight. This variation may also result in a change in aerodynamic forces. A Gottingen 723 wing section was mounted at a constant angle of attack of five degrees and at various clearances above a stationary ground plane in a wind tunnel. The wing was studied in both lifting and down-force configurations and the Reynolds number of the flow was 20,000. The wingtip vortices were investigated using laser sheet smoke visualisation (LSV) in order to visualise the flow and to gain a quantitative estimate of the downstream progress. Significant lateral movement of the wingtip vortices near the ground was seen (up to 40% span movement at ten chord lengths downstream) for both lifting and down-force; lifting wing vortices moved outboard and down-force wing vortices moved inboard.
机译：当举升体在表面附近产生翼尖涡流时，这些涡流向下游移动时的横向运动可能与自由飞行中看到的横向运动不同。这种变化也可能导致空气动力的变化。在风洞中，哥廷根723机翼部分以5度的恒定迎角安装在固定地面平面上方的各个间隙处。对机翼进行了升力和降力两种配置的研究，流的雷诺数为20,000。使用激光烟幕可视化技术（LSV）对翼尖涡旋进行了研究，以可视化流动并获得下游进程的定量估计。对于升力和向下力，都可以看到翼尖涡旋在地面附近有明显的横向运动（在下游的十个弦长处，跨度运动高达40％）。升翼涡旋向外侧移动，而下压力翼涡旋向内侧移动。

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