The analysis of flow fields for smoke-preventing air curtain in the high-rise building

摘要

The purpose of smoke proof design for high-rise building is to prevent harm from smoke and to control smoke-diffusing. The effective smoke-preventing installation should have the functions such as absolute smoke insulation, going into and coming off the smoke-preventing place freely, no confinement of sight. Through analyzing smoke-flow field theoretically, it is discussed that the effect of air flow on a high-rise building is as a result of gas expansion by the temperature, the chimney effect, the outdoor wind power and the ventilation and air-conditioning system when firing. The flow field at the staircase door is theoretically found. The way in which the diffusion of smoke is controlled is advanced according to the principle of flow line-flow rate and based on the previous experimental researches by others, the calculation method for the smoke-preventing air curtain is inferred in this paper.