发表机构
Center for Fluid Mechanics, School of Engineering, Brown University（布朗大学工程学院流体力学中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出同步阴影与激光PIV技术，实现近壁与远场流速同时测量，并成功应用于仿虾机器人流场，为多尺度流固耦合研究提供新实验途径。
AI 中文摘要
实验流固耦合（FSI）通常涉及在空间和时间尺度上同时发生的现象，这些尺度差异巨大。例如，圆柱体后方的分离泡及其尾流中的涡旋相互作用，或单个游泳者产生的流动与整个群体运动所产生的流动。基于成像的流固耦合现象流动研究具有挑战性，往往导致对不同流动区域进行单独分析。本工作引入了同步阴影和激光粒子图像测速（PIV），以同时获取近壁和远场流速测量。本文开发的实验装置首次实现了阴影和激光PIV之间的同步比较，证明阴影测速在宏观尺度上可以达到与激光测量相当的精度。随后，我们利用这种新的组合流动测量技术，完整捕捉了仿虾水下机器人产生的速度场，采用激光PIV记录机器人周围的流动，并使用阴影PIV聚焦于执行器，成像激光技术因壁面反射和结构后方阴影而无法分辨的区域。阴影和激光PIV的同步应用为深入了解流固耦合现象的物理机制提供了一条新的实验途径。
英文摘要
Experimental Fluid-Structure Interaction (FSI) often involves phenomena that occur simultaneously across vastly different spatial and temporal scales. For example, the separation bubble behind a cylinder and the vortex interactions in its wake, or the flow produced by an individual swimmer and the flow generated by the movement of the entire swarm. Imaging-based flow studies of such FSI phenomena are challenging and often lead to separate analyses of different flow regions. This work introduces simultaneous shadow and laser-based Particle Image Velocimetry (PIV) to obtain concurrent near-wall and far-field flow velocity measurements. The experimental setup developed here enables the first simultaneous comparison between shadow- and laser-based PIV, demonstrating that shadow velocimetry can achieve accuracy comparable to laser-based measurements at the macro scale. We then use this new combined flow measurement technique to fully capture the velocity field generated by a shrimp-inspired underwater robot, employing laser PIV to record the flow surrounding the robot and shadow PIV to focus on the actuators, imaging regions that the laser technique cannot resolve due to wall reflections and shadows behind the structures. The simultaneous application of shadow- and laser-based PIV offers a new experimental avenue for gaining insights into the physics of FSI phenomena.
