Abstract
In the authors' previous study, using the Fire Dynamics Simulator (FDS), the tunnel fires were simulated, and these results mimic other research result. This article shows the effect of water droplet diameter of the sprinkler for controlling the thermal flow and smoke flow. The fires in small size tunnel with width 6m, height 3m and length 800m are simulated by FDS with the water screen, created by 6 sprinklers. Simulations are performed with various water droplet diameters and two kinds flow rate. These results show that the traveling distance of thermal and smoke flow is shortest when the water droplet diameter is smallest.
