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首页> 外文期刊>International Journal of Heat and Fluid Flow >Experimental investigation of the flow around a simplified ground vehicle under effects of the steady crosswind
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Experimental investigation of the flow around a simplified ground vehicle under effects of the steady crosswind

机译：稳定侧风作用下简化地面车辆周围流动的实验研究

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摘要

Crosswinds which stem from on-road flow conditions can deteriorate a ground vehicle's driving performance. In spite of the numerous studies investigating aerodynamics of the ground vehicles in the previous literature, there is still a need for thorough understanding of the underlying flow phenomena related to crosswind sensitivity of the ground vehicles. Therefore, the present study is aimed to investigate characteristics of the flow features around the ground vehicles under steady crosswind conditions within a range of yaw angles 0 degrees = beta = 15 degrees using the Ahmed vehicle model with rear slant angles of alpha = 25 degrees and 35 degrees. Throughout the investigations, flow visualizations using dye injection technique and velocity measurements using particle image velocimetry PIV technique are conducted. The Reynolds number of the flow which is based on the free stream flow velocity U = 200 mm/s and height of the model H = 72 mm is Re-H = 1.4 x 10(4). Results are presented in terms of time averaged vorticity omega contours and streamline Psi patterns together with velocity magnitude (( u (2)+ w (2))(1/2)/U) of the flow fields. Additionally, turbulence quantities such as Reynolds stresses u'w' /U-2 and turbulent kinetic energy TKE are presented and discussed in details. Results of the present study show that characteristics of the flow features in the near wake region downstream of the Ahmed model are very sensitive to the effects of the crosswind.
机译：由道路流动条件引起的侧风会降低地面车辆的驾驶性能。尽管在先前的文献中进行了大量研究地面车辆的空气动力学的研究，但是仍然需要透彻理解与地面车辆的侧风敏感性有关的潜在流动现象。因此，本研究旨在使用后倾角为α= 25的艾哈迈德车辆模型研究在偏航角0度<= beta <= 15度的范围内稳定横风条件下地面车辆周围流动特性的特性度和35度。在整个研究过程中，进行了使用染料注入技术的流动可视化和使用粒子图像测速PIV技术的速度测量。基于自由流流速U = 200 mm / s和模型高度H = 72 mm的流雷诺数为Re-H = 1.4 x 10（4）。结果以时间平均涡度轮廓和流线模式以及流速的大小（（（2）+ （2））（1/2）/ U）表示领域。另外，提出并详细讨论了湍流量，例如雷诺应力 / U-2和湍动能TKE。本研究的结果表明，艾哈迈德模型下游近尾流区的流动特征对侧风的影响非常敏感。

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