Numerical study on the impact of Mach number on the coupling effect of aerodynamic heating and aerodynamic pressure caused by a tube train

Super high-speed evacuated tube transport is an important development direction of green, energy-saving, and low-drag rail transit in the future. A great deal of aerodynamic heat and pressure change are produced by a tube train running in a closed and long tube with a big blocking ratio at high speed, and the shock wave generated by the train running at supersonic speed further aggravates the aerodynamic phenomenon in the tube, resulting in a large increase of temperature and abrupt pressure change in the tube, endangering the structural safety of the vehicle body and affecting the normal operation of equipment in the vehicle and tube. The purpose of this paper is to find new aerodynamic phenomena, study the formation and evolution mechanism of aerodynamic heating in the tube and influence of the Mach number at subsonic, transonic, and supersonic speed. The results show that shock waves appear in the front and rear of the tube train, the shock reflection is confined to the expansion wave at the tail of the tube train, and the flow field around the tube train, pressure, temperature, and so on in the tube are significantly changed by the shock wave.