Research on aerodynamic and thermal characteristics of subsonic evacuated tube maglev system

The aerodynamic thermal effect is important for the design of evacuated tube maglev system. Based on Sutherland viscosity equation and SST k-ω turbulence model, the aerodynamic characteristics and aerodynamic thermal effect of three-dimensional compressible subsonic evacuated tube maglev system are numerically simulated. The blockage ratio ranges from 0.1 to 0.4 and the train running speed ranges from 600 km/h to 1000 km/h. The results show that the variation of the surface temperature of the head car and the middle car is similar under different conditions. The surface temperature of the tail car increases obviously due to the generation of rear shock waves, and the amplitude increases with the increment of speed and blockage ratio. Under the condition of choke, the maximum temperature at nose of the tail car is basically linear relationship with the blockage ratio and speed. Shock waves are generated at the streamline of the tail car and the suspension gap. The shock wave in the tube has typical three-dimensional characteristics and periodicity. The shock wave cluster reflected between the track and the tube forms the characteristics of low temperature at the tail and alternating temperature behind the train.