Investigate the Wake Flow on Houseflies with Particle-Tracking-Velocimetry and Schlieren Photography
Investigate the Wake Flow on Houseflies with Particle-Tracking-Velocimetry and Schlieren Photography
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DOI：
10.1007/s42235-022-00277-y
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发表时间：
2022-10-09
影响因子：
4
通讯作者：
Lozano, Angel David
中科院分区：
文献类型：
--
作者：
Liu, Yun;Lozano, Angel David
利用高速纹影照相术和粒子跟踪测速仪对家蝇尾流进行了研究。高速纹影摄影是在一个具有稳定垂直温度梯度的空气容器内对被拴住的家蝇进行的，以可视化昆虫扰乱的尾流。然后，用基于物理的光流法处理得到的摄影图像，以求出光路平均流速。此外，最先进的技术：在一只被拴住的家蝇上安装了Shake-the-Box系统，以测量昆虫尾流中的体积流场，揭示了有趣的流动行为和结构，也可以观察到并与纹影摄影图像相关联。比较两个实验得到的尾流的无量纲速度量级，定性上是一致的，这表明高速纹影摄影在研究小昆虫尾流方面是可行的。此外，高速纹影摄影成功地应用于一只正在从地面起飞的家蝇，可视化了自由飞行的昆虫上的扰动尾流，这是用其他方法难以可视化的。
Utilizing high-speed schlieren photography and particle-tracking-velocimetry, the wake flow of tethered houseflies is investigated. The high-speed schlieren photography is implemented on tethered houseflies inside an air container with a stable vertical temperature gradient to visualize the disturbed wake flow from the insects. The resulting photography images were then processed with the physics based optical flow method to derive the light-path averaged flow velocity. Additionally, the state of the art: Shake-the-Box system is implemented on a tethered housefly to measure the volumetric flow field in the wake of the insect, revealing interesting flow behavior and structures that can also be observed and correlated to the schlieren photography images. Comparing the dimensionless velocity magnitude of the wake flow from the two experiments, a good qualitative agreement is reached, suggesting the viability of high-speed schlieren photography in investigating the wake flow of small insects. Furthermore, the high-speed schlieren photography is successfully applied on a housefly that is taking off from the ground, visualizing the disturbed wake flow on the freely flying insect that is challenging to visualize with other methods.