Vertical Flow Mechanism of Fire Smoke in High-rise Buildings with Internal Corridor

Analyzing numerous computational fluid dynamics (CFD) simulations of a high-rise building with internal corridor, the airflow velocity, height of neutral plane and carbon monoxide concentration under different heat release rate (HRR) of fire were investigated. The result shows that with the HRR growing, the airflow velocity increases significantly, while the flow structure has no obvious change. The dependence of neutral plane height on HRR is weak. When the HRR increases from 2MW to 10MW, the height of neutral plane just increases 4.2%. The area affected by smoke containing CO is not significantly increase with the HRR growing. However, the CO concentration increases remarkably, which indicates that rapid evacuation is crucial for the people on the higher floor. (paper)