Small Model Experiment on the Gradient of Pressure Wave by Entering the Tunnel of a Conventional Limited Express

Abstract

When a high-speed train enters a long tunnel, an air compression wave is generated. This wave propagates in the tunnel at the speed of sound and a pulsed pressure wave is emitted from the tunnel exit. The emitted wave is closely related to the rate of change of pressure as the compression wave arrives at the tunnel exit. Recently, because the running speed of trains has increased, even conventional limited express trains encounter the problem of tunnel pressure wave propagation. In this study we obtained data on the rate of change of pressure and compared the influence of various nose geometries and train speed.