TEMPERATURE PROPERTY OF CEILING JET IN THE SLOPE WAY CONNECTED TO FIRE ROOM

Abstract

　In the underground spaces, stairs (=slope way) are used as a passage that was connected to the ground level. When a fire occurs near it, smoke spread through the slope way. Previous studies on slope way have focused on the tunnel. Here, the tunnel is connected to ambient air at both ends. However, this study is assumed to be a staircase (= slope way), one opening of the slope way is connected to the adjacent space, and only the other opening is connected to ambient air. And opening jet plume flows in the slope way. Here, except that the opening jet plume flows in the slope way, it will be shown the property of smoke close to the tunnel. Thus, the purpose of this study is to predict the maximum temperature rise of the smoke in the slope way, it is improved that the maximum temperature rise of the smoke prediction model in an inclined tunnel.

　In this study, a series of experiments were carried out by changing the opening shape, the length of the slope way, the angle of slope way, and the diameter of the source of fire, etc.

　As the results, the knowledge about the temperature property of ceiling jet in the slope way could be obtained as follows;

・ The maximum temperature of the smoke in the slope way decreased when the distance of movement r_d and angle of the slope way θ becomes bigger.

・ Coefficient α_d at the prediction model of smoke maximum temperature in the slope way is bigger than Coefficient α at the prediction model of smoke maximum temperature in the tunnel.

・ The distance of virtual heat source r₀ at which the maximum temperature rise ΔT_max of smoke in the slope way becomes to 0 [K] is given by Eq. (14) ~ Eq. (15).