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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 smoke prevention design for high-rise buildings is to prevent smoke damage and control the diffusion of smoke. High-efficiency smoke prevention devices should have the functions of absolute smoke separation, free access to smoke-isolating places, and no influence on the visual field. This paper discusses the flow field characteristics of the antechamber door through the analysis of the mechanism of the flue gas flow, and uses the theoretical method to establish the flow field at the antechamber door. According to the principle of streamline flow, it is proposed to use smoke-proof air curtains to control the diffusion of smoke during fires. Based on predecessors’ experimental research, the calculation method of smoke-proof air curtain was derived.