Numerical Study of Reduction of External Pressure Variation and Micro-Pressure Wave for high-speed train in tunnel

초록

When a train passes a conventional tunnel at high speed, external pressure variation problem arises. It is known that this issue can be reduced by controlling the tunnel length. We studied the variances of external pressure variation within the tunnel, by altering the length of the dummy tunnel duct. We also studied the variances of micro-pressure waves at the exit of tunnel, by altering surface area of dummy tunnel duct. For analyzing this train-tunnel relation problem, axi-symmetric unsteady compressible flow solver was used.