高层建筑火灾时前室门的流场分析

The Analysis of Flow Field at the Staircase Door in the High rise Building When Firing

高层建筑防烟设计的目的是为了防止烟害并对烟气扩散进行控制，高效防烟装置应具有绝对隔烟、自由出入隔烟场所、不影响视野等功能。该文通过对烟气流动的机理分析，讨论了前室门的流场特性，用理论的方法建立了前室门处的流场。根据流线流量原理，提出在火灾时用防烟空气幕控制烟气的扩散。在前人试验研究的基础上，导出防烟空气幕的计算方法。

The purpose of smokeproof 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 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 infered in this paper.