Aerodynamic heating distribution of the inner wall in an evacuated tube structure

To investigate the distribution of Aerodynamic Heating (AH) on ultra-high-speed Evacuated Tube Structures (ETS), a 2D fluid simulation model utilizing the overset grid method was developed. The model comprehensively considered the internal track heat source and fluid-solid coupling heat transfer analysis. The distribution of AH on the inner wall was studied, taking into account various factors, including vacuum level, blocking ratio, train speed and operating time intervals. The results reveal that the radiation from the internal heat source can impact AH along the height of the ETS. Meanwhile, vacuum degree exhibit only limited effects on temperature rise in the tube. On the other hand, blocking ratio and train speed are identified as major factors significantly influencing AH, the residual temperature can rise 55 K. Furthermore, the number of train operations is a linear increasing with the residual temperature. If effective cooling measures are not implemented, the increased residual temperature can have an impact on the tube.