大体积空间层析粒子成像测速揭示沙漠蝗虫的复杂空气动力学足迹

2017/12/11   下载量： 4 次

方案摘要

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应用领域 航空航天
检测样本 航空
检测项目
参考标准 暂无

采用LaVision公司独有的可以应用到大体积空间的时间分辨层析粒子成像测速技术（Time-resolved Tomographyic PIV)对沙漠蝗虫在风洞环境下的复杂空气动力学行为进行了研究。

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Particle image velocimetry has been the preferred experimental technique with
which to study the aerodynamics of animal flight for over a decade. In that
time, hardware has become more accessible and the software has progressed
from the acquisition of planes through the flow field to the reconstruction of
small volumetric measurements. Until now, it has not been possible to capture
large volumes that incorporate the fullwavelength of the aerodynamic track left
behind during a complete wingbeat cycle. Here, we use a unique apparatus to
acquire the first instantaneous wake volume of a flying animal’s entire wingbeat.
We confirm the presence of wake deformation behind desert locusts
and quantify the effect of that deformation on estimates of aerodynamic force
and the efficiency of lift generation. We present previously undescribed
vortex wake phenomena, including entrainment around the wing-tip vortices
of a set of secondary vortices borne of Kelvin–Helmholtz instability in the
shear layer behind the flapping wings.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 层析PIV研究约束喷射冲击沸腾过程中的蒸汽诱导流动结构

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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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