Abstract: In order to explore the impacts of the overflowing smoke of fire compartment on the building facade and the upper rooms, a 4∶1 experimental model was built based on similarity principle to carry out the combustion experiment. Different window aspect ratios and fire power values were set under windless condition. The law of morphological characteristics of overflowing smoke near the wall,and the change of overflowing smoke width were analyzed. The temperature and CO concentration in the upper room were discussed. The results show that when the aspect ratio of the window is greater than 1 and the fire power value is lower, the heating effect of the overflowing smoke near the wall is not obvious, and the impacts on upper compartments and adjacent compartments are smaller, and that controlling the aspect ratio and the fire power can restrain the harm caused by the overflowing smoke.

Key words: overflowing smoke, attached plume, aspect ratio, fire power, plume width