Research on the Influence of Vacuum Pipe Blocking Ratio on the Aerodynamic Characteristics of Super High Speed Train

Based on the three-dimensional viscous, steady, incompressible NS equation and the standard $\mathrm{k}-\varepsilon$ two-equation turbulence model, this paper establishes a three-dimensional static fluid calculation model for the vacuum pipeline ultra-high-speed train, and the flow field analysis software ANASYS/Fluent was used to simulate the aerodynamic performance of the vacuum piping system under different operating speeds, pipe block ratios and pipe pressure conditions. The calculation results show that when the pipeline pressure and the operating speed is constant, the larger the blocking ratio is, the greater the aerodynamic resistance experienced by the train, the greater the blockage ratio of the vacuum pipeline, the more drastic the change in the aerodynamic resistance of the car body; When the train runs under the same pipeline blocking ratio, the aerodynamic resistance experienced by the train increases with the increase of running speed and pipeline pressure.