Aerothermal mechanisms induced by the super high-speed evacuated tube maglev train

Aerothermal effects generated by the evacuated tube maglev train (ETMT) cannot be ignored as it moves at the super high-speed. The study on the aerothermal mechanism induced by ETMT is of great significance to the design and application of heatproof materials on the skins of tube wall and vehicle. Based on the combination methods of dynamic layering mesh and dynamic adaptive mesh, the high-speed movement process of ETMT was reproduced by numerical simulation. The results show that the main frequency and amplitude of the ETMT skin temperature fluctuation in the "steady" stage have certain stochastic characteristics in spatial distribution. Separation and reattachment of the boundary layer contribute to decrease and increase of the ETMT skin temperature respectively. Besides, both expansion wave and shock wave near tail car increase the ETMT skin temperature. The normal shock wave in front of ETMT makes the tube wall temperature reach the maximum, while the normal shock wave behind ETMT makes the tube wall temperature reach relatively low due to the complicated interactions between reflected shocks wave and expansion shocks wave in wake. In wake, the tube wall temperature caused by the shock wave is higher than that caused by the expansion wave at any time.