Particle image velocimetry of the underfloor flow for generic high-speed train models in a water towing tank
Particle image velocimetry of the underfloor flow for generic high-speed train models in a water towing tank
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DOI：
10.1177/0954409712470607
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发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
M. Jönsson;C. Wagner;S. Loose
中科院分区：
文献类型：
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作者：
M. Jönsson;C. Wagner;S. Loose
采用双分量粒子图像测速技术，对3种不同的1：50通用高速列车模型以4 m/s（雷诺数为0.24 × 106）的速度通过水牵引水池时，在光滑地面、粗糙地面和有轨枕地面上的地板下流场进行了测量。参考列车模型由四节汽车组成，具有车厢间间隙和每节车厢两个转向架。这些特征被移除并且所有间隙被闭合以创建平滑列车配置，而粗糙列车配置具有所有间隙但没有转向架。最低的地板下的流速和速度梯度在地面上的光滑的列车模型与轨枕观察。此外，测量结果表明，任何额外的不规则性的底部导致区域的特点是流动加速，否则库埃特样流，这增加了可能性的压舱物飞行。因此，可以得出结论，光滑的底部可以降低压载飞行的风险。参考列车模型获得的结果进行了比较与一个完整的规模测量。结果表明，列车缩尺模型水拖曳水池试验的结果反映了足尺测量的地板下水流的主要特征。
The underfloor flow field of three different 1:50 generic high-speed train models hauled through a water towing tank at a speed of 4 m/s (Reynolds number = 0.24 × 106) over smooth ground, rough ground, and ground with sleepers is measured by means of two-component particle image velocimetry. The reference train model, consisting of four cars, features inter-car gaps and two bogies per car. These features are removed and all gaps are closed to create the smooth train configuration whereas the rough train configuration has all the gaps but no bogies. The lowest underfloor flow velocities and velocity gradients at the ground are observed for the smooth train model on the ground with sleepers. Furthermore, the measurements reveal that any additional irregularity of the underbody leads to regions characterised by flow acceleration in the otherwise Couette-like flow and this increases the possibility of ballast flight. Therefore, it is concluded that a smooth underbody can lower the risk of ballast flight. The results obtained for the reference train model are compared with those of a full-scale measurement. It is shown that the results of the water towing tank experiments with the scaled train model reflect the main characteristics of the underfloor flow of the full-scale measurements.