|Assessment of localized fire behaviors in large open-plan compartments
|Jiang, Liming (BSE)
Heat -- Transmission
Hong Kong Polytechnic University -- Dissertations
|Department of Building Services Engineering
|iii, 83 pages : color illustrations
|In recent years, with the rapid economic development and the gradual improvement of people's material and spiritual needs, more and more large-scale open buildings such as shopping centers, stadiums, art galleries, and airports have appeared in our lives. Compared with traditional small enclosed buildings, this kind of building has the advantages of high strength, convenient construction, and strong practicability. For example, Shanghai Poly Grand Theater and Beijing Daxing International Airport are all representative large-scale open buildings in recent years. However, contrary to many advantages, large open-plan buildings also have brought many difficulties and challenges to fire protection design and rescue due to their complex internal structure, oversized and special cargo storage, complex surrounding environment, and a large flow of people. The project used Fire Dynamic Simulator (FDS) to simulate the localized fire behaviors in a large open-plan compartment. This project studied the effect of heat flux distribution under different fire sizes and different ventilation conditions on the surrounding combustibles, separately. And characterized the spreading mechanism of the traveling fire. The research results indicate that the distribution of radiant heat flux on the surface of combustibles is related to the fire size, the radiant distance, and the ventilation conditions of the compartments. Specifically, when the fire size is smaller, the radiant distance is shorter, and the ventilation condition is better, the thickness of the smoke layer is thinner, and the radiant heat flux at each point of the combustible is smaller. At this time, the spreading speed of the traveling fire is smaller. On the contrary, traveling fire spreads faster. Besides, in the vertical distribution of heat flux, it is found that the radiant heat flux is the largest at a position roughly 0.5 m higher than the base of the flame. Subsequently, the radiant heat flux decreases as the height increases.
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