Preliminary Study on Clearance Area of Single-Line High-Speed Maglev Tunnel Based on Passenger Pressure Comfort

Abstract

High-speed maglev trains will cause severe pressure fluctuations when passing through tunnels, causing problems such as passenger comfort and car body aerodynamic fatigue. Enlarging the tunnel clearance area is a basic measure to significantly reduce pressure fluctuations, but it will also bring about construction cost issues. In this paper, a one-dimensional compressible unsteady non-isentropic flow model is used to simulate the pressure wave by the source code of the charac-teristic line of the generalized Riemann variable. The characteristics of the pressure wave caused by a single train passing through a tunnel at a speed of 600 kilometers per hour are studied. The critical tunnel length with different time interval comfort standards as indicators is obtained. The influence of the dynamic airtightness of the train on the critical tunnel length is determined. The proposed value of clearance area for single-track tunnels that meets different comfort standards at home and abroad is proposed. This provides a technical basis for supplementing relevant domestic technical standards.