Maximum dynamic equivalent leakage area while high-speed train passing through tunnels

The external pressure of coaches was simulated based on one-dimensional, compressible, non-homentropic and unsteady flow model and the method of characteristics of generalized Riemann variables aiming at problems of static air tightness parameters being not able to truly reflect air tightness performance and inside pressure comfort when the train passing through tunnels. The leaked air mass flow was corrected, and the equivalent leakage area method was used to obtain the interior pressure while the high-speed train passing through the tunnel. The maximum dynamic equivalent leakage area values of the different coaches were analyzed based on the background of Mountain passenger dedicated line while the pressure inside coaches meeting different comfort standards. The recommended dynamic equivalent leakage area values for the single train meeting different comfort standards at different speeds were given. The dynamic equivalent leakage area is the smallest when the pressure inside cars meets the standard of 1 000 Pa/10 s. The minimum equivalent leakage area values decrease with the increase of train speed. The recommended threshold values of the equivalent leakage area for the first/last and middle coaches are 23.2 cm2 and 45.6 cm2, respectively. Copyright ©2021 Journal of Zhejiang University (Engineering Science). All rights reserved.