抄録
We have experimentally investigated temperature distributions in a plume generated by a ventilation-controlled and medium-size pool fire. The pool diameter and the fuel were 450 mm and ethanol, respectively. The dimension of the compartment was set to 3.6 m (L) × 2.4 m (B) × 2.4 m (H), which corresponds to that for IS09705 room-corner test. The parameter was flow rates of ventilation: the flow rate for each of tests were changed from 0.025 m^3 s^<-1> to 0.130 m^3 s^<-1>. The time-series of heat release rate, HRR, of fire and O2 concentration of low layer in the compartment (fresh air) shows that the HRR and O2 concentration decreases with time; the minimum O2 concentration yields to extinguishing and the significant reduction in HRR. The temperature profiles along a center line of the pool preserve the similarity even for the unsteady HRR, implying that zone models, which are a kind of fire model used in engineering applications, have a capability to represent the plume structure under ventilation conditions.
