Scaling applications of wall parameters in a tunnel fire

摘要

Scale criterion has been proposed for tunnel fires, however, some parameters are usually not feasible to be implemented. In this study, numerical and experimental simulations have been performed to validate the scale criterion. First, the wall thickness parameter was studied since it plays an important role in the heat conduction. The results of the simulations were compared with Hu's full-scale experimental data. Then, the other ambient temperature and wall materials parameters were investigated through the numerical simulations. Furthermore, a series of experiments were conducted in two reduced-scale tunnel tables. The simulation results showed that when the ambient temperature varied with the scale criterion, the decay speed of the dimensionless smoke temperature for the 1/18 scale becomes a little smaller. Experimental results showed that the decay speed of dimensionless temperature rises if both the asbestos and steel board was smaller. However, the decay speed in the cases of steel boards was larger than that of the simulation results. Moreover, when the aluminum silicate board was used as the wall material, the results of numerical simulations agreed well with experiments in the near-field. But when x/H 4, the decay speed of dimensionless temperature rise for experiments was larger than numerical simulations.