| Summary: | Fire alarm system relates the safety of people's life and property when the fire occurs in high-rise buildings. The characteristic of the smoke spread process in the fire is a crucial problem for design of the fire alarm system. In this paper, the smoke spread process under different ceiling heights is investigated via the computational fluid dynamics method and the numerical simulation in high-rise buildings. The temperature, visibility and obscuration rate in the fire are discussed and the technology about the fire alarm system is studied. From the simulation results, some conclusions are obtained as follow. When the height of ceiling with the smoke detectors is above 16.0 m, the higher ceiling, the lower temperature, and the detected maximum temperature is below 35.0 °C. The alarm time of the smoke detector lags that of the cloud chart of visibility, since it takes time for the smoke to propagate in the dark room inside the detector. When the ceiling height is below 8.0 m, the horizontal installation way of the line type smoke detector (LSD) is better than the vertical way. Simulation results show that the numerical simulation method is reliable and used widely in the fire information research.
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