Scaled experiments using the helium technique to study the vehicular blockage effect on longitudinal ventilation control in tunnels

Wilson Ulises Rojas Alva, Grunde Jomaas, Anne Dederichs

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Abstract

A model tunnel (1:30 compared to a standard tunnel section) with a helium-air smoke mixture was used to study the vehicular blockage effect on longitudinal ventilation smoke control. The experimental results showed excellent agreement with full-scale data and confirmed that the critical velocity decreases in proportion with the blockage ratio. Nevertheless, it was found that the relative position of the fire source and the relative size of the vehicular blockage can have an opposite effect, as the vehicular blockage influenced the critical and confinement velocity. The method demonstrated the ability to provide valuable information on the effect of vehicular blockage on tunnel fire dynamics.
Original languageEnglish
Title of host publicationProceedings of the 16th International Symposium on Aerodynamics, Ventilation & Fire in Tunnels
Number of pages16
Publication date2015
Pages49-64
Publication statusPublished - 2015
Event16th International Symposium on Aerodynamics, Ventilation & Fire in Tunnels - Seattle, United States
Duration: 15 Sep 201517 Sep 2015
Conference number: 16

Conference

Conference16th International Symposium on Aerodynamics, Ventilation & Fire in Tunnels
Number16
CountryUnited States
CitySeattle
Period15/09/201517/09/2015

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