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首页> 外文会议>International Conference on Experimental Fluid Mechanics >Experimental Investigation of Vortex Structures in Wake of Hyperboloid-Shaped Model by Means of 2D Particle Image Velocimetry Measurement
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Experimental Investigation of Vortex Structures in Wake of Hyperboloid-Shaped Model by Means of 2D Particle Image Velocimetry Measurement

机译：通过2D粒子图像测速测量测量双曲面模型涡旋结构的实验研究

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This paper deals with flow around a bluff body of hyperboloid shape. It consists of results gathered in the course of research by means of Particle Image Velocimetry (PIV). The experiments were carried out by means of low-frequency 2D PIV in a range of Reynolds numbers from 40000 to 50000. A hyperboloid-shaped model was measured in a wind tunnel with a modelled atmospheric boundary layer (and additionally, in a low-speed wind tunnel with low turbulence). The model was tested in a subcritical range of Reynolds numbers and various planes in a wake of the model were captured with the intention of getting an estimation of 3D flow structures. The tunnel with the modelled atmospheric boundary layer has a high rate of turbulence, so the influence of the turbulence of incoming flow on the wake could be outlined. The ratio of the height of the model to a thickness of the modelled boundary layer in the tunnel was 1/3, meaning the turbulence in the boundary layer strongly influenced the flow around the model; it suppresses the wake which leads to a lot shorter area of recirculation than low turbulence incoming flow would cause.
机译：本文涉及双曲面形状的虚弱体流。它包括通过粒子图像VELOCIMETRY（PIV）在研究过程中聚集的结果。通过40000至50000的雷诺数范围内的低频2D PIV进行实验。用模拟的大气边界层（且以低速）在风洞中测量双曲线形模型风隧道与低湍流）。在亚临临rynolds数字的亚基范围内测试模型，并且捕获了模型之唤醒的各种平面，其目的是获得3D流结构的估计。具有建模的大气边界层的隧道具有高湍流速率，因此可以概述进入流动湍流的影响。模型的高度与隧道中建模边界层的厚度的比率为1/3，这意味着边界层中的湍流强烈影响模型周围的流动;它抑制了比低湍流传入流量更短的再循环区域导致较短的次脉冲。

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