Numerical Studies on the Temperature and Pressure Changes of a Maglev Train Surface Moving Dynamically in a Vacuum Tube

The existence of the vacuum tube train can improve the efficiency of transportation. However, the complex aerodynamic phenomena cause drastic environmental fluctuations in the tube, which are concentrated on pressure and temperature. On the background of an under-constructed test platform, using three-dimensional numerical methods, a vacuum tube train model is established to analyze the environmental changes on the surface of the train dynamically during the acceleration process, uniform motion process and deceleration process. The result proposed that the specific aerodynamic phenomena such as shock wave, expansion wave and choked flow, are the main reasons for the changes of pressure and temperature. During the acceleration process, the generation of the shock wave, expansion wave and choked flow causes the drastic changes of the temperature and pressure. During the uniform motion process, a normal shock wave generated in front of the choked flow enhances the increase of temperature and pressure, yielding the maximum values at the end of this process. During the deceleration process, the disappearance of shock wave and the reflection of the expansion waves in the rear cause the sudden changes on the temperature and pressure.