沙漠蝗虫飞行尾流的层析粒子成像测速研究：瞬态体积组合揭示隐藏的漩涡单元和快速尾流变形

2013/06/02   下载量： 7 次

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应用领域 农/林/牧/渔
检测样本 其他
检测项目 理化分析>其他
参考标准

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 stereoimaging 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.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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