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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Robotic PTV study of the flow around automotive side-view mirror models
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Robotic PTV study of the flow around automotive side-view mirror models

机译：机器人PTV对汽车侧视镜模型的流动的研究

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摘要

The flow around three simplified models of side-view mirrors for automobiles is experimentally investigated by means of Robotic particle tracking velocimetry (PTV). The measurements are performed coupling a coaxial volumetric velocimeter with time-resolved three-dimensional (4D) Lagrangian Particle Tracking (LPT) data analyzed with the Shake-The-Box (STB) algorithm. Helium-filled soap bubbles were used as tracers in the wind tunnel experiment to achieve the measurement volume needed for characterizing the flow structures around and behind the models of automobile side-view mirrors. The aspect ratio of all the models is kept constant to H/W = 2. The effect of a slant angle at the front and the reduction of cross section at the model root are specifically investigated respectively using model 2 and model 3. In model 1 which represents generic geometry having semi-cylinder-spherical shape, the extension of the recirculation zone shrank in the z direction due to the free-end effect. When the flow is developing downstream, a vortex pair inclines towards the ground plane due to the downwash effect. This streamwise vortex shows a dipole distribution. In model 2 the trailing vortex does not fall toward downstream because a base vortex with opposite sign formed under the trailing vortex. This prevents the downwash flow from reaching the ground plane. In model 3, a streamwise vortex is generated from a strong upwash flow, which generates a short trailing vortex up to x/H = 1. This occurs because the vortex that was formed from the top and side end is suppressed and destroyed. The leg of the reverse U-shape structure of model 1 is almost perpendicular to the ground plane. However, in models 2 and 3, vortex shedding near the bottom is delayed, and an arch vortex is slightly slanted toward the model body.
机译：通过机器人颗粒跟踪速度（PTV）通过机器人颗粒跟踪速度实验研究了汽车侧视镜的三个简化模型的流动。使用抖动 - 箱（STB）算法分析的时间分辨的三维（4D）拉格朗日粒子跟踪（LPT）数据来执行测量同轴体积速度计。氦气浸泡泡沫作为风洞实验中的示踪剂，以实现在汽车侧视镜的模型周围和后面的流动结构所需的测量体积。所有模型的纵横比保持恒定到H / W = 2.使用模型2和模型3分别研究了模型根部的前部和横截面的横截面的减小的效果。在型号1中这表示具有半圆柱形形状的通用几何形状，由于自由终效果，再循环区的延伸在Z方向上缩小。当流动在下游开发时，由于洗涤效果，涡流对朝向地平面倾斜。此StreamWise vortex显示了偶极分布。在模型2中，尾随涡流不会朝下游落下，因为基础涡流具有在尾部涡旋下形成相反的标志。这可以防止液压流从接地平面到达。在模型3中，从强制挤压液流产生流动涡流，这产生高达X / H = 1的短尾部涡流。这是因为抑制了由顶端和侧端形成的涡流被抑制和破坏。模型1的反向U形结构的腿几乎垂直于地平面。然而，在模型2和3中，底部附近的涡流脱落延迟，拱涡体略微向模型体略微倾斜。

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