Aerodynamic Noises of Vacuum Tube Transportation: A Simulation and Theoretical Study

The fluid fields,around the high-speed train running at different Mach numbers in vacuum tube transportation(VTT),were empirically approximated,mathematically modeled on the basis of Lighthill acoustic analysis scheme,theoretically analyzed and numerically simulated in finite element method with software FLUENT.The distribution,spectral characteristics and acoustic pressure of the far-field aerodynamic noises,generated by the high-speed trains travelling in the vacuum tube,were calculated.The simulated results show that the streamlined train-head is the main source of noises,because it generates fast airflow,strong disturbance,high pulsation pressure and violent turbulence; that is,the pulsation pressure on the surfaces of train-head makes the strongest aerodynamic noises.