摘要：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/H20.06. The axial plume temperature rise increases with the increase of the A/H2 when the height (z) is lower than 20 m, while the axial plume temperature rise decreases with the increase of the area-height-squared ratio at z 30 m.
