CFD Research And Platform Docking Design Of High Speed Vacuum Pipeline Train

Evacuated Tube Transportation,as a possible mainstream mode of transportation in the future,shoulders the heavy responsibility of passenger transportation and cargo transshipment.Compared with the traditional rail transit mode,it has the advantages of ultra-high speed,low energy consumption,no noise,no pollution and so on.The operation can not only highlights the original technical advantages of Maglev train,but also minimizes the aerodynamic drag of train operation.Therefore,it is very important to study CFD research on ETT train.And,it is necessary to put forward a reasonable design scheme of vacuum platform docking in order to realize safe and efficient boarding and disembarking of passengers and cargo.In this paper,the aerodynamic drag of a train is numerically simulated,and the effects of various physical quantities on the aerodynamic drag of the train are compared.Based on the three-dimensional,steady,incompressible and standard two-equation turbulence model,the external flow field of high-speed vacuum pipeline train is simulated and analyzed.Fluent is used to simulate and calculate the aerodynamic resistance of the train at different speeds,pipeline pressures and blocking ratios.The selected train speeds are 100m/s,150m/s and 200m/s;the selected pipeline pressures are 0.1 atm,0.2atm and 0.3atm;and the selected blocking ratios are 0.2,0.3 and 0.4.The flow field simulation results show that the aerodynamic drag of the train will be increases with the increase of train running speed,the increase of pipeline pressure and the increase of blocking ratio.The blocking ratio also affects the air flow,which shows that the larger the blocking ratio is the air flow velocity in the pipeline.Based on the platform docking scheme of Swissmetro system in Switzerland,this paper makes corresponding improvements to solve the problem of too large airtight space when the automatic gate of Swissmetro system closes.Three new docking design schemes are proposed,which are filling platform docking design,lifting isolation device platform docking design and translation isolation device platform docking design.These three docking design schemes improve docking efficiency by reducing the volume of the closed space formed when the gate is closed.