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Measurements of the flow due to a rapidly pitching plate using time resolved high resolution PIV

机译：使用时间分辨的高分辨率PIV测量由于快速倾斜板而产生的流量

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The flow topology arising from unsteady airfoil motion is complex, but the benefits of understanding such flows extend to a wide variety of applications. Natural flows such as those induced by birds or insects during flapping flight, or by the rapidly moving fins of swimming fish, as well as flows over the manoeuvring wings of micro air vehicles (MAVs) or the rotors of helicopters or wind turbines exhibit behaviours typical of rapidly manoeuvring airfoils. This paper presents measurements and discussion on a set of recent experiments performed on a rapidly pitching plate in low Reynolds number flow. Time resolved particle image velocimetry (PIV) data with a high spatio-temporal resolution are presented, and the main features of the flow are identified. Measurements are taken at six Reynolds numbers ranging between 1500 and 10000 and an analysis is given of the temporal evolution of the massively separated flow at the leading edge as well as at the trailing edge and in the wake. Individual coherent structures are located and tracked, and the variation of their strength and fluctuation are quantified as a function of time. Several key observations are made regarding the effect of Reynolds number on the topology of the wake structure of a pitching flat plate. (C) 2014 Elsevier Masson SAS. All rights reserved.
机译：由不稳定的翼型运动引起的流动拓扑是复杂的，但是了解这种流动的好处扩展到了各种各样的应用中。自然流动，例如在扑翼飞行中由鸟类或昆虫引起的自然流动，或由游动的鱼鳍快速移动引起的自然流动，以及在微型飞行器（MAV）的机动翼或直升机或风力涡轮机的旋翼上流过的自然流动快速机动的机翼。本文介绍了在低雷诺数流量的快速变桨板上进行的一组近期实验的测量和讨论。提出了具有高时空分辨率的时间分辨粒子图像测速（PIV）数据，并确定了流的主要特征。在1500和10000之间的六个雷诺数下进行测量，并给出了在前缘，后缘和尾流处大规模分离流动的时间演化分析。定位并跟踪各个相干结构，并根据时间对其强度和波动的变化进行量化。关于雷诺数对俯仰平板的尾流结构拓扑的影响，有几个关键的观察。 （C）2014 Elsevier Masson SAS。版权所有。

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