Flow visualization experiments were conducted in a water channel and a low-speed wind tunnel at Reynolds number of 1.54 \(\times\) 10⁴ to 1.2 \(\times\) 10⁵ for a leading-edge extension model, which is referred to as a NASA TP-1803 model in this study. In addition, particle image velocimetry velocity measurements were taken in the water channel to obtain the quantitative information about the three-dimensional velocity field over the strake and wing surfaces. The results obtained at low, medium and high angles of attacks represent three distinct cases of interaction between the strake and wing vortices. Namely, at α = 5^o and 10° the strake and wing vortices were developed over the wing surface without significant interaction noticed; at α = 20°, the strake vortex strongly interacted with the wing vortex in an intertwining manner, which was sensitive to Reynolds number; at α = 30°, the breakdown of the strake vortex took place close to the junction of the strake and the wing; thus, the interaction of the strake and the wing vortices appeared to be less significant than the case of α = 20°.

Graphic abstract

中文翻译：

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LEX 配置上的涡流相互作用

在雷诺数为 1.54 \(\times\) 10 ⁴ to 1.2 \(\times\) 10 ^{5 的}水道和低速风洞中进行了流动可视化实验，为前沿扩展模型，其被称为在本研究中作为 NASA TP-1803 模型。此外，在水道中进行了粒子图像测速速度测量，以获得有关翼板和机翼表面三维速度场的定量信息。在低、中和高攻角下获得的结果代表了板条和机翼涡流之间相互作用的三种不同情况。即，在α  = 5 ^o和 10°，在机翼表面上形成了板条和机翼涡流，而没有注意到显着的相互作用；在α  = 20°时，边条涡与翼涡以相互缠绕的方式强烈相互作用，对雷诺数敏感；在α  = 30° 时，板条涡的击穿发生在板条和机翼连接处附近；因此，与α  = 20°的情况相比，板条和机翼涡流的相互作用似乎没有那么显着。

图形摘要