Temperature stratification in a road tunnel

Abstract

Tests were conducted to study the temperature distribution and stratification of smoke in a tunnel at 1-D 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. (ref. 13). However, a good agreement was obtained.