Tomographic particle image velocimetry of desert locust wakes: instantaneous volumes combine to reveal hidden vortex elements and rapid wake deformation
Tomographic particle image velocimetry of desert locust wakes: instantaneous volumes combine to reveal hidden vortex elements and rapid wake deformation
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DOI：
10.1098/rsif.2012.0418
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发表时间：
2012-12-07
影响因子：
3.9
通讯作者：
Hollis, David
中科院分区：
文献类型：
--
作者：
Bomphrey, Richard J.;Henningsson, Per;Hollis, David
动物在飞行中产生的空气动力学结构是不稳定和复杂的。最近的进展，在定量流动可视化推进了我们的动物空气动力学的理解，但测量迄今为止仅限于在一个平面通过尾流的流速。我们采用了紧急，高速，体积流体成像技术（层析粒子图像测速）检查沙漠蝗虫的唤醒段，捕捉全三维瞬时流场。我们使用这些流场以前所未有的细节来表征空气动力学足迹，并揭示了以前看不见的尾流元素，这些元素不会被二维或立体成像技术检测到。涡等值面地形显示的空气动力产生的时空签名，表现在后蝗虫，并暴露在何种程度上动物尾流可以变形，可能导致不可靠的计算时，使用传统的诊断方法的升力和推力。我们讨论的实验设计和分析的影响，体积流量成像变得更加普遍。
Aerodynamic structures generated by animals in flight are unstable and complex. Recent progress in quantitative flow visualization has advanced our understanding of animal aerodynamics, but measurements have hitherto been limited to flow velocities at a plane through the wake. We applied an emergent, high-speed, volumetric fluid imaging technique (tomographic particle image velocimetry) to examine segments of the wake of desert locusts, capturing fully three-dimensional instantaneous flow fields. We used those flow fields to characterize the aerodynamic footprint in unprecedented detail and revealed previously unseen wake elements that would have gone undetected by two-dimensional or stereo-imaging technology. Vortex iso-surface topographies show the spatio-temporal signature of aerodynamic force generation manifest in the wake of locusts, and expose the extent to which animal wakes can deform, potentially leading to unreliable calculations of lift and thrust when using conventional diagnostic methods. We discuss implications for experimental design and analysis as volumetric flow imaging becomes more widespread.