Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel
Jet fan ventilation strategy in case of fire in bi-directional road tunnels is focused on maintaining smoke stratification. There are several factors influencing stratification under specific conditions. In this paper smoke movement during a 5 MW fire in a 600 m long road tunnel is studied by comput...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2018-01-01
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| Series: | ITM Web of Conferences |
| Online Access: | https://doi.org/10.1051/itmconf/20181602002 |
| _version_ | 1819178933827928064 |
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| author | Weisenpacher Peter Glasa Jan Valasek Lukas |
| author_facet | Weisenpacher Peter Glasa Jan Valasek Lukas |
| author_sort | Weisenpacher Peter |
| collection | DOAJ |
| description | Jet fan ventilation strategy in case of fire in bi-directional road tunnels is focused on maintaining smoke stratification. There are several factors influencing stratification under specific conditions. In this paper smoke movement during a 5 MW fire in a 600 m long road tunnel is studied by computer simulation and the influence of slope and external temperature on smoke stratification is analysed. Calculations were performed on a high performance computer cluster using parallel version of Fire Dynamics Simulator. Smoke stratification upstream of the fire is maintained in every simulation scenario with the exception of declivous tunnel, in which buoyancy intensifies backlayering. The behaviour of the smoke movement downstream of the fire is more complex. In the case of horizontal tunnel the stratification is not maintained in the vicinity of the fire and region with untenable conditions expands downstream. In the tunnel with slope of -2° this expansion is accelerated, while in the tunnel with slope of 2° untenable conditions spread in opposite direction. The influence of exterior temperature higher than temperature inside the tunnel is relatively weak in horizontal tunnels; however, it becomes very important in sloping tunnels, especially downstream of the fire. |
| first_indexed | 2024-12-22T21:50:26Z |
| format | Article |
| id | doaj.art-de1333bc2e774de582588a56fd67df5c |
| institution | Directory Open Access Journal |
| issn | 2271-2097 |
| language | English |
| last_indexed | 2024-12-22T21:50:26Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | ITM Web of Conferences |
| spelling | doaj.art-de1333bc2e774de582588a56fd67df5c2022-12-21T18:11:22ZengEDP SciencesITM Web of Conferences2271-20972018-01-01160200210.1051/itmconf/20181602002itmconf_amcse2018_02002Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnelWeisenpacher PeterGlasa JanValasek LukasJet fan ventilation strategy in case of fire in bi-directional road tunnels is focused on maintaining smoke stratification. There are several factors influencing stratification under specific conditions. In this paper smoke movement during a 5 MW fire in a 600 m long road tunnel is studied by computer simulation and the influence of slope and external temperature on smoke stratification is analysed. Calculations were performed on a high performance computer cluster using parallel version of Fire Dynamics Simulator. Smoke stratification upstream of the fire is maintained in every simulation scenario with the exception of declivous tunnel, in which buoyancy intensifies backlayering. The behaviour of the smoke movement downstream of the fire is more complex. In the case of horizontal tunnel the stratification is not maintained in the vicinity of the fire and region with untenable conditions expands downstream. In the tunnel with slope of -2° this expansion is accelerated, while in the tunnel with slope of 2° untenable conditions spread in opposite direction. The influence of exterior temperature higher than temperature inside the tunnel is relatively weak in horizontal tunnels; however, it becomes very important in sloping tunnels, especially downstream of the fire.https://doi.org/10.1051/itmconf/20181602002 |
| spellingShingle | Weisenpacher Peter Glasa Jan Valasek Lukas Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel ITM Web of Conferences |
| title | Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel |
| title_full | Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel |
| title_fullStr | Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel |
| title_full_unstemmed | Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel |
| title_short | Influence of slope and external temperature on smoke stratification in case of fire in bi-directional road tunnel |
| title_sort | influence of slope and external temperature on smoke stratification in case of fire in bi directional road tunnel |
| url | https://doi.org/10.1051/itmconf/20181602002 |
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