doiSerbia

Temperature stratification in a road tunnel

Kalech Brahim (LETTM, Faculty of Sciences of Tunis, El Manar, University of Tunis-El Manar, Tunisia)
Mehrez Zouhaier (LETTM, Faculty of Sciences of Tunis, El Manar, University of Tunis-El Manar, Tunisia)
Bouterra Mourad (LETTM, Faculty of Sciences of Tunis, El Manar, University of Tunis-El Manar, Tunisia)
el Cafsi Afif (LETTM, Faculty of Sciences of Tunis, El Manar, University of Tunis-El Manar, Tunisia)
Belghith Ali (LETTM, Faculty of Sciences of Tunis, El Manar, University of Tunis-El Manar, Tunisia)

Tests were conducted to study the temperature distribution and stratification of smoke in a tunnel at one-dimensional propagation phase, the ventilation strategy varies in these trials. Numerical results showed that there are three layers of flow in the different strategies, the smoke layer, intermediate mixture layer and training fresh air layer. A barrier effect has been shown for the distribution of the temperature of the smoke upstream. The temperature and the velocity of movement of the smoke flow were influenced by the type of ventilation strategy. Stratification of the flow is characterized by a Richardson number. This numerical study requires validation with the work of Hu et al. [11]. However, a good agreement was obtained.

Keywords: tunnel fire, stratification, temperature, FDS