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Comparison of different configurations of aerodynamic braking plate on the flow around a high-speed train

机译:空气动力学制动板在高速列车周围流动的不同配置

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End of vehicle streamlined head was selected as the installation location, and aerodynamic behavior of trains with and without braking plates was compared to analyze the formation of the braking force and the evolution of the flow field. An IDDES method based on the SST κ–ω turbulence model was used to investigate the unsteady flow, and the numerical algorithm was validated. Results show that the train aerodynamic drag was significantly increased by opening the braking plates, especially when several braking plates were arranged separately in series on each train car. Furthermore, the effect of the plate installed on the tail car was superior to that of the braking plate on the head car, when only a single braking plate was used. It was also found that both the maximum value of the slipstream and negative pressure close to the braking plate depend on the position and size of the braking plate. The flow field around the lower part of the train was only slightly affected by opening the braking plates, and pairs of vortices over the train appeared when the braking plates were opened, significantly affected both size and position of vortices in the train wake.
机译:将简化的头部的末端选择为安装位置,并将在与制动板的培训的空气动力学行为进行比较,以分析制动力的形成和流场的演变。使用基于SSTκ-ω湍流模型的IDDES方法来研究不稳定的流量,验证了数值算法。结果表明,通过打开制动板,列车空气动力学阻力显着增加,特别是当在每个火车车上串联布置若干制动板时,若干制动板。此外,当仅使用单个制动板时,安装在尾部车上的板的效果优于头部车辆上的制动板的效果。还发现,靠近制动板的滑流和负压的最大值均取决于制动板的位置和尺寸。列车下部围绕的流场仅通过打开制动板略微影响,并且当制动板打开时,火车上的涡流对出现了一对,显着影响火车尾部的漩涡的尺寸和位置。

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