Effect of Smoke Barrier in Narrow Space on Smoke Flow Utilizing CFD

Abstract

In this paper, we build the relational models between the height of smoke barrier and the flow of gas, the depth and mean temperature of smoke layer in critical value, respectively. These models are based on the analysis of gas flow in narrow space of smoke barrier which is combined with the classic Hydraulic Jump model in the field of mechanics. For different initial conditions of gas, we simulate the effect of smoke barrier height on flue gas flow via the fire dynamics simulation software FDS. The results show that: the air entrainment and the depth of smoke layer in critical value are decreasing constantly while the critical mean temperature of smoke layer is raising during the increasing of the height of smoke barrier. Thus, when it gets the zero value, the air entrainment and the depth of smoke layer in critical value will get the maximum and the critical mean temperature of smoke layer will get the minimum. And when the height of smoke barrier greater than or equal the value of z_0, the value of air entrainment will be zero.