Pressure drop caused by a fire in a tunnel

P Carlotti (1) , Pietro Salizzoni (2)

1 LCPP - Laboratoire Central de la Préfecture de Police
2 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique

For many applications, one dimensional models of smoke motion are very useful. In spite of the limitation inherent to such models, they provide the ability to model a full tunnel system, even with ramications, in a fully unsteady mode, with a very short computing time. However, these models need to have realistic evaluations of the various pressure drops which occur. One of these pressure drops is due to the three dimensional eects of the re source itself, with the bending and distortion of streamlines. In practical applications, there are mainly two methods which are used to model this pressure drop: either only the obstruction of the tunnel by the burning vehicle is taken into account, or an empirical formula is used. This formula may come from eld measurements (see for example CETU (2003)) or CFD data (see for example Dutrieue & Jacques (2006)). In the present paper, we recast results of obstruction models and empirical formulae in terms of dimensional analysis. We compare these estimations with data from a small scale experimental facility.

Domaines: Sciences de l'ingénieur [physics]; Infrastructures de transport; Milieux fluides et réactifs

P Carlotti, Pietro Salizzoni. Pressure drop caused by a fire in a tunnel. ISAVFT, Sep 2017, Lyon, France. ⟨hal-03793384⟩