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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 >The effect of tail geometry on the slipstream and unsteady wake structure of high-speed trains
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The effect of tail geometry on the slipstream and unsteady wake structure of high-speed trains

机译：尾部几何上的效果对高速列车滑翔和不稳定唤醒结构的影响

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摘要

The effect of varying the roof-angle of the tail of a generic high-speed train on the unsteady wake structure and corresponding slipstream is investigated in a 1/10th scale wind-tunnel experiment. Insight into the slipstream and unsteady flow features are gained from 4-hole dynamic pressure probe measurements, surface-flow visualisations, measurements from a two-dimensional array of total pressure probes, and frequency analysis. The results show that increasing tail roof angle leads to a transition from an unsteady wake with a pair of streamwise vortices that exhibit sinusoidal, antisymmetric motion to an unsteady wake dominated by large-scale separation with vortex shedding from the sides of the train. It is the interaction of the streamwise vortices with vortex shedding from the sides that results in the widest unsteady wake, and consequently, the largest slipstream velocities. (C) 2017 Elsevier Inc. All rights reserved.
机译：在一个1/10尺度风隧道实验中，研究了改变通用高速列车尾部尾部的尾部尾角和相应的滑流。 从4孔动态压力探测测量，表面流量等压，来自总压力探针的二维阵列和频率分析的频率分析中获得了滑流和非定常流量功能的洞察。 结果表明，尾部屋顶角度的增加导致从不稳定的醒来的过渡，与一对流动的涡流，将正弦的涡流表现出正弦的，反对称动作，以与火车两侧的涡流脱落的大规模分离为主。 它是流动涡流与涡旋脱落的相互作用，从而导致最宽的不稳定唤醒，因此，最大的滑流速度。 （c）2017年Elsevier Inc.保留所有权利。

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