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通过对烟气流动的机理分析，分别讨论了火灾时温度引起的气体膨胀、高层建筑的烟囱效应、室外风力和建筑物内空调及通风系统对建筑物内部空气流动的影响．用理论方法建立前室门处的流场，根据流线流量原理，提出用空气幕控制烟气的扩散，并在前人试验研究的基础上，导出防烟空气幕设计参数的数学模型
Through the analysis of the mechanism of flue gas flow, the effects of temperature expansion caused by fire, chimney effect of high-rise buildings, outdoor wind power, and the air-conditioning and ventilation system inside the building on the air flow inside the building were discussed. The flow field at the antechamber door is established by theoretical methods. According to the principle of streamline flow, the air curtain is used to control the diffusion of the flue gas. Based on previous experiments, a mathematical model for the design parameters of the smoke curtain is derived.