| Recently, the high-rise building like tower takes a more important role in high-rise buildings due to its unique adaptability. In this dissertation, aiming for the smoke control design on safe core in high-rise building like tower, the basic disciplinarian of smoke spread in vertical shaft as an important route way for evacuation was studied, and a simple plume model under stack effect was developed. Finally some creative viewpoints on effective smoke control in safe core of high-rise building were discussed.Based on the comparability theory, a scaling shaft model was established for studying the relationships of temperature on the bottom, the top of shaft and velocity on the opening of fire room with distance between fire source and centerline of shaft. After dealing with the experimental data by dimensionless theory, a new steady model on the distribution of temperature and velocity was introduced, and the critical dimensionless number of none-stagnant movement in different conditions such as close shaft and open shaft was studied. It is shown that the reasons that stack effect appears are due to the combined buoyancy- and pressure-driven flow in a vertical shaft generally. But each force is dominant in some characteristic domain: pressure difference takes the most important role where l/ L< 0.825, and when l/ L> 0.825 , buoyancy is the most important factor.Based on the theoretical results, the rise-time of plume was measured by using a scaling experiments and full-scale tests which were performed at the PolyU/USTC Atrium. A relation between dimensionless rise-time of plume front and dimensionless height of the shaft was deduced. The traveling time of fire plume front is inversely proportional to the 1/3 power of the heat release rate of source, proportional to the 1.03 and the 1.50 power of the height in open and closed shafts, respectively. The plume front spread in open shaft is faster than that in free space and close shaft due to...
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