Purpose

The aerodynamic differences between the head car (HC) and tail car (TC) of a high-speed maglev train are significant, resulting in control difficulties and safety challenges in operation. The arch structure has a significant effect on the improvement of the aerodynamic lift of the HC and TC of the maglev train. Therefore, this study aims to investigate the effect of a streamlined arch structure on the aerodynamic performance of a 600 km/h maglev train.

Design/methodology/approach

Three typical streamlined arch structures for maglev trains are selected, i.e. single-arch, double-arch and triple-arch maglev trains. The vortex structure, pressure of train surface, boundary layer, slipstream and aerodynamic forces of the maglev trains with different arch structures are compared by adopting improved delayed detached eddy simulation numerical calculation method. The effects of the arch structures on the aerodynamic performance of the maglev train are analyzed.

Findings

The dynamic topological structure of the wake flow shows that a change in arch structure can reduce the vortex size in the wake region; the vortex size with double-arch and triple-arch maglev trains is reduced by 15.9% and 23%, respectively, compared with a single-arch maglev train. The peak slipstream decreases with an increase in arch structures; double-arch and triple-arch maglev trains reduce it by 8.89% and 16.67%, respectively, compared with a single-arch maglev train. The aerodynamic force indicates that arch structures improve the lift imbalance between the HC and TC of a maglev train; double-arch and triple-arch maglev trains improve it by 22.4% and 36.8%, respectively, compared to a single-arch maglev train.

Originality/value

This study compares the effects of a streamlined arch structure on a maglev train and its surrounding flow field. The results of the study provide data support for the design and safe operation of high-speed maglev trains.

中文翻译：

---

典型拱结构对600 km/h磁浮列车滑流和尾流的影响

目的

高速磁浮列车头车（HC）和尾车（TC）空气动力学差异显着，给运行带来控制困难和安全挑战。拱形结构对磁浮列车HC、TC气动升力的提高有显着效果。因此，本研究旨在研究流线型拱结构对600 km/h磁浮列车气动性能的影响。

设计/方法论/途径

磁浮列车选取了三种典型的流线型拱结构，即单拱、双拱和三拱磁浮列车。采用改进的延迟分离涡模拟数值计算方法，对不同拱结构磁浮列车的涡结构、列车表面压力、边界层、滑流和气动力进行了比较。分析了拱形结构对磁浮列车气动性能的影响。

发现

尾流动态拓扑结构表明，拱形结构的改变可以减小尾流区域的涡尺寸；与单拱磁浮列车相比，双拱和三拱磁浮列车的涡流尺寸分别减小了15.9%和23%。峰值滑流随着拱结构的增加而减小；双拱和三拱磁浮列车比单拱磁浮列车分别降低8.89%和16.67%。气动力表明，拱形结构改善了磁浮列车HC和TC之间的升力不平衡；与单拱磁浮列车相比，双拱和三拱磁浮列车分别提高了22.4%和36.8%。

原创性/价值

本研究比较了流线型拱形结构对磁悬浮列车及其周围流场的影响。研究结果为高速磁浮列车的设计和安全运行提供数据支持。