Numerical Simulation Research on Kitchen Fire of Ancient Buildings Under Water Spray Effect

Abstract

Kitchen fire has been becoming the majority risk to the ancient buildings, as the insufficient firefighting device, the excessive fuel, and the lower fire resistance structure. Due to the ancient buildings’ crowded layout in historical block, once the fire spread over the kitchen inner space, the fire becoming bigger and spreading faster. In this paper, a numerical simulation research was carried to access the effective of water spray in the kitchen fire of ancient buildings. The heat release rate (HRR), smoke temperature and spread process has been obtained, the efficiency of general water spray and kitchen special water spray has been compared, the necessary of the fire alarm device and the water spray have also discussed. The result indicated that the HRR peak is controlled by the water spray and fire detector devices, the activity time of water spray is the majority factor. Without the firefighting device, the flame temperature is approximate to 400 ℃. With the kitchen water spray and fire detector the fire will be controlled in 32.7s with a HRR peak is 2.52 kW. The numerical simulation result indicated that it is necessary for the ancient building’s kitchen to fix the firefighting devices.

Keywords: kitchen fire, numerical simulation, water spray, fire alarm