Pressures and velocities inside trains - Influence of inter-car connections

A. E. Vardy, M. Sima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The potential influence of airflow leakage between adjacent cars along a train is assessed and different outcomes are found for (i) well-sealed, high-speed trains and (ii) nominally unsealed, lower-speed trains. For the former, it is shown that inter-car leakage has the potential to decrease the maximum pressure changes experienced by passengers and hence could enable the required cross-sectional area of tunnels to be reduced. Likewise, it could enable train operation at increased speeds in existing tunnels. For the latter (unsealed trains), it is shown that inter-car leakage would have a smaller influence on maximum pressure changes experienced by passengers. Inter-car leakage implies the existence of longitudinal airflows along cars. It is shown that these are small in wellsealed trains, but that they could cause unacceptably large velocities in restricted-area regions of unsealed trains.

Original languageEnglish
Title of host publication17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
Place of PublicationUnited States
PublisherBHR Group Limited
Pages5-24
Number of pages20
ISBN (Print)9781510851665
Publication statusPublished - Dec 2017
Event17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 - Lyon, France
Duration: 13 Sep 201715 Sep 2017

Conference

Conference17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
Country/TerritoryFrance
CityLyon
Period13/09/1715/09/17

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