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首页> 美国卫生研究院文献>Journal of the Royal Society Interface >A fish perspective: detecting flow features while moving using an artificial lateral line in steady and unsteady flow
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A fish perspective: detecting flow features while moving using an artificial lateral line in steady and unsteady flow

机译：鱼的视角：在稳定和不稳定的流动中使用人工侧向线移动时检测流动特征

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For underwater vehicles to successfully detect and navigate turbulent flows, sensing the fluid interactions that occur is required. Fish possess a unique sensory organ called the lateral line. Sensory units called neuromasts are distributed over their body, and provide fish with flow-related information. In this study, a three-dimensional fish-shaped head, instrumented with pressure sensors, was used to investigate the pressure signals for relevant hydrodynamic stimuli to an artificial lateral line system. Unsteady wakes were sensed with the objective to detect the edges of the hydrodynamic trail and then explore and characterize the periodicity of the vorticity. The investigated wakes (Kármán vortex streets) were formed behind a range of cylinder diameter sizes (2.5, 4.5 and 10 cm) and flow velocities (9.9, 19.6 and 26.1 cm s−1). Results highlight that moving in the flow is advantageous to characterize the flow environment when compared with static analysis. The pressure difference from foremost to side sensors in the frontal plane provides us a useful measure of transition from steady to unsteady flow. The vortex shedding frequency (VSF) and its magnitude can be used to differentiate the source size and flow speed. Moreover, the distribution of the sensing array vertically as well as the laterally allows the Kármán vortex paired vortices to be detected in the pressure signal as twice the VSF.
机译：为了使水下航行器成功地检测并导航湍流，需要检测发生的流体相互作用。鱼具有称为侧线的独特感觉器官。称为神经质的感觉单元分布在它们的身体上，并向鱼类提供与流量有关的信息。在这项研究中，一个三维鱼形头，装有压力传感器，用于研究对人工侧线系统的相关流体动力刺激的压力信号。目的是检测非定常的尾流，以检测流体动力学轨迹的边缘，然后探索并表征涡旋的周期性。在一定范围的圆柱直径大小（2.5、4.5和10 cm）和流速（9.9、19.6和26.1 cm s -1 ）之后形成了所研究的尾流（卡尔曼涡街）。结果表明，与静态分析相比，在流中移动有利于表征流环境。前平面中从最前端到侧面传感器的压力差为我们提供了从稳定流到不稳定流过渡的有用度量。涡旋脱落频率（VSF）及其大小可用于区分震源大小和流速。此外，垂直和横向感测阵列的分布允许在压力信号中检测到Kármán涡旋配对的涡旋，是VSF的两倍。

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