Numerical simulation of smoke natural filling in ultra-thin and tall atrium

Abstract

In this paper, the natural filling law of smoke in ultra-thin and tall atrium was studied by means of numerical simulations. The results show that, the axial plume velocity of the ultra-thin and tall atrium has a good exponential function dependence on the Q˙1/3z−1/3, and the axial plume temperature rise has a good power function dependence on the Q˙2/3z−5/3. When the cross-sectional shape is circle, the plume moves faster, while the cross-sectional shape has little effect on the axial plume temperature rise far from the fire source. Area-height-squared ratio (A/H2) has a little influence on the axial plume velocity in the atrium for A/H2 30 m.

Keywords

• Ultra-thin and tall atrium
• Axial plume velocity
• Axial plume temperature rise
• Influencing factor