Underfloor flow measurements of a 1:50 generic high-speed train-set by means of high-speed PIV in a water towing tank
Underfloor flow measurements of a 1:50 generic high-speed train-set by means of high-speed PIV in a water towing tank
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通过水拖水池中的高速 PIV 测量 1:50 通用高速列车的地板下流量
DOI：
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发表时间：
2013
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影响因子：
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通讯作者：
S. Loose
中科院分区：
文献类型：
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作者：
M. Jönsson;C. Wagner;S. Loose
在列车速度为4m/S(雷诺数=0.25·106)的拖水池中，用双分量高速粒子图像测速仪测量了平坦地面、粗糙地面和有枕木地面上3种不同的1：50高速列车配置的轨道对称线上的底部流场。高速列车配置是通过改变4单元通用高速列车模型(两节端车和两节中间车)的地板下粗糙度来实现的。参考列车模型代表具有车厢间间隙和每节车厢两个转向架的传统非铰接式高速列车。通过移除转向架并覆盖所有间隙，获得了完全平滑的下腹部，因为第三种没有转向架的列车配置，所有留出的间隙反映了一个粗糙的下腹部。
结果表明，转向架、转向架壳体、车间缝隙或空洞等车底不平顺都会加速车底流动，说明平坦的车底会降低道碴飞跃的几率。此外，带有单块枕木和较低道床高度的轨道床的道碴飞跃风险比具有双块枕木的轨道床低。
Two-component high-speed particle image velocimetry measurements of the underfloor flow field in the rail symmetry-line of three different 1:50 high-speed train configurations hauled over a smooth ground, a rough ground and a ground with sleepers were conducted in a water towing tank at a train speed of 4 m/s (Reynolds number=0.25•106). The high-speed train configurations were realised by changing the underfloor roughness of the 4-unit generic high-speed train model (two end-cars and two mid-cars). The reference train model represents a conventional non-articulated high-speed train with inter-car gaps and two bogies per car. A completely smooth underbelly was achieved by removing the bogies and covering all the gaps as the third train configuration without bogies and all gaps left open reflects a rough train underbelly.
The results revealed that any underfloor irregularities such as bogies, bogie housings, inter-car gaps or cavities accelerates the underfloor flow concluding that a smooth train underfloor decreases the chance of ballast flight. Furthermore, the risk of ballast flight is lower for a trackbed with monoblock sleepers and a lowered ballast level than for a trackbed with bi-block sleepers.