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

A. E. Vardy; M. Sima

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

A. E. Vardy
, M. Sima

Civil Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
Place of Publication	United States
Publisher	BHR Group Limited
Pages	5-24
Number of pages	20
ISBN (Print)	9781510851665
Publication status	Published - Dec 2017
Event	17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 - Lyon, France Duration: 13 Sept 2017 → 15 Sept 2017

Conference

Conference	17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
Country/Territory	France
City	Lyon
Period	13/09/17 → 15/09/17

ASJC Scopus subject areas

Civil and Structural Engineering
Safety, Risk, Reliability and Quality
Building and Construction

Cite this

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title = "Pressures and velocities inside trains - Influence of inter-car connections",

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.",

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note = "17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 ; Conference date: 13-09-2017 Through 15-09-2017",

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TY - GEN

T1 - Pressures and velocities inside trains - Influence of inter-car connections

AU - Vardy, A. E.

AU - Sima, M.

PY - 2017/12

Y1 - 2017/12

N2 - 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.

AB - 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.

UR - http://www.proceedings.com/37047.html

M3 - Conference contribution

AN - SCOPUS:85040229516

SN - 9781510851665

SP - 5

EP - 24

BT - 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017

PB - BHR Group Limited

CY - United States

T2 - 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017

Y2 - 13 September 2017 through 15 September 2017

ER -

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

Abstract

Conference

ASJC Scopus subject areas

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