Abstract In this study, we analyse the unsteady flow around a 1/8th-scaled uniform vehicle model with three configurations of aerodynamic braking plates mounted at the inter-carriage region. In addition, the study aims at determining an appropriate plate configuration to obtain an increasing effect of aerodynamic drag and analyses the effect of plates on the flow field at the top of the vehicle, where a pantograph and an air-conditioning unit are installed. Improved delayed detached eddy simulations are conducted with shear-stress transport κ–ω turbulence model, and the results are compared with the experimental data and grid independence to validate the reliability of the obtained solution. Furthermore, the aerodynamic drag of the vehicles is significantly increased when the plates are opened and the aerodynamic braking distance is significantly decreased, especially for the single large plate mounted downstream of the inter-carriage region, followed by the single large plate mounted at the upstream of the inter-carriage region. In addition, the flow field around the inter-carriage region is more sensitive to the size of plates than their location. Both the pantograph and air-conditioning unit restrict the development of airflow downstream of the plates, and should thus be located as far away from the inter-carriage region as possible. Although the pantograph–catenary system would be affected by the opening of plates, the effect is not very large. The findings of this study can also be conducive to help engineers design and operate an optimal aerodynamic braking system.

中文翻译：

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装有受电弓和空调装置的高速列车车厢间区域空气动力制动板增强制动效果的对比研究

摘要 在这项研究中，我们分析了 1/8 比例均匀车辆模型周围的非定常流动，该模型具有安装在车厢间区域的三种空气动力制动板配置。此外，该研究旨在确定合适的板配置以获得增加的气动阻力效应，并分析板对车辆顶部流场的影响，在那里安装了受电弓和空调装置。改进的延迟分离涡模拟是用剪应力传输 κ-ω 湍流模型进行的，并将结果与​​实验数据和网格独立性进行比较，以验证所获得解的可靠性。此外，开板时车辆气动阻力显着增加，气动制动距离显着减小，尤其是安装在车厢间区域下游的单个大板，其次是安装在上游的单个大板跨运区域。此外，车厢间区域周围的流场对板的尺寸比它们的位置更敏感。受电弓和空调装置都限制了板下游气流的发展，因此应尽可能远离车厢间区域。受电弓-悬链线系统虽然会受到板块开口的影响，但影响不是很大。