Identification of vortex pairs in aircraft wakes from sectional velocity data
Identification of vortex pairs in aircraft wakes from sectional velocity data
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根据截面速度数据识别飞机尾流中的涡对
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Monnier
中科院分区：
文献类型：
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作者：
C. Carmer;R. Konrath;A. Schröder;J. Monnier
飞机后面的多涡尾流系统的动态危害空中交通也可以通过物理模型进行评估。在自由飞行实验室和水拖曳水池中对多涡系统进行了大规模的实验室研究。专门的PIV测量提供垂直于尾流轴的时间分辨流速场。不同的涡基识别方案的平面速度数据的适用性，并证明了不等强度的同向和反向旋转涡对。大涡脱落的翼梢和襟翼识别采用一个基于Escheru的标准。它们的合作机制的产生和衰减证明从等值面的平方旋流强度和进一步的特征涡参数。
The dynamics of multiple-vortex wake systems behind aircraft endangering air traffic can be assessed also from physical modelling. Large-scale laboratory investigations of multiple-vortex systems have been performed in a free-flight laboratory and in a water towing tank. Specialized PIV measurements provide time-resolved flow velocity fields normal to the wake axis. The applicability of various ∇u-based vortex identification schemes to planar velocity data is addressed and demonstrated for unequal-strength co- and counter-rotating vortex pairs. Large vortices shed off the wing tips and flaps are identified employing a ∇u-based criterion. Their cooperative mechanisms of generation and decay are evidenced from iso-surfaces of squared swirling strength and from further characteristic vortex parameters.