地铁换乘车站建筑形式特殊,其火灾烟气特性与普通地下建筑有着较大差异。针对某地铁换乘站的防火问题,采用CFD大涡模拟场模型进行地铁换乘车站火灾烟气特性的模拟分析,对不同危险场景下换乘站内的烟气扩散和运动规律进行了分析研究,验证原有排烟设计的有效性。通过分析发现传统的分区排烟模式不能很好的控制烟气的蔓延,针对这种情况,应用性能化防火设计的原理对车站的防排烟系统进行了改造设计,提高了地铁车站防排烟系统的整体能力,达到了对火灾烟气进行控制和保证人员安全疏散目的,并采用先进的虚拟现实技术,结合CFD数值模型构建了集成的火灾数值虚拟仿真平台,进行该车站的防排烟系统改造设计进行了模拟与分析,获得了具有高度真实感的地铁换乘站火灾烟气蔓延过程。此外,通过研究发现,除传统排烟风速和排烟量等指标对烟气控制有较大影响外,不同排烟方案和整个排烟系统的运行模式对烟气扩散和人员安全疏散也有重要的影响。 Subway transfer station building in the form of special, the characteristics of its fire smoke and ordinary underground construction are quite different. Aiming at the fire prevention problem of a subway interchange station, CFD large eddy simulation model was used to simulate the fire smoke characteristics of subway transfer stations. The smoke diffusion and movement rules in transfer stations under different dangerous scenarios were analyzed. Verify the effectiveness of the original exhaust design. According to the analysis, it is found that the traditional district smoke pattern can not control the spread of flue gas. In view of this situation, the design of smoke control and smoke exhaust system of the station is modified by the principle of performance-based fire protection design, System’s overall ability to achieve the purpose of fire flue gas control and to ensure the safety of personnel evacuation and the use of advanced virtual reality technology, combined with CFD numerical model to build an integrated fire numerical simulation platform for the station’s smoke control system Retrofit design was simulated and analyzed to obtain a highly realistic subway station fire smoke spread process. In addition, the study found that, in addition to the traditional smoke exhaust velocity and exhaust and other indicators have a greater impact on flue gas control, the different smoke program and the entire exhaust system operating mode of smoke diffusion and personnel evacuation is also important influences.