Influence of Cross-Pass Piping Parameters on the Running Resistance of Vacuum Tube Trains

In order to investigate the influence of cross-pass pipe parameters (cross-pass pipe length, cross-pass pipe spacing, cross-sectional area size) on the running resistance of vacuum tube trains, this paper conducts numerical simulations in Fluent for trains with different running conditions and obtains the running resistance of trains running in vacuum tube transportation systems with cross-pass pipes through numerical simulations. The results show that the running resistance of a vacuum tube train with a cross-pipe is significantly reduced compared to that of a single vacuum tube train. As the length of the cross-pipe increases, the train running resistance first decreases and then rises slightly; when the length of the tube reaches 8 m, increasing the length again has less effect on the train running resistance; as the interval of the cross-pipe increases, the train running resistance first increases and then decreases, when the interval reaches 2.5 times the body length, the train running resistance fluctuates slightly; as the cross-sectional diameter increases from 1.0 m to 2.0 m, the cross-sectional area increases from 0.79 m² to 3.14 m², the train running resistance decreases approximately linearly with the increase of the cross-sectional area.