带上盖开发地铁车辆段咽喉区排烟系统研究
Study on the smoke exhaust system for throat area of metro depot with over development

为探究带上盖开发的地铁车辆段咽喉区排烟系统的合理设计方案，基于火灾科学与流体力学的基本理论，采用理论分析与数值模拟相结合的方法对自然排烟方式和组合排烟方式的关键参数及烟气控制效果进行研究。研究结果表明：在自然排烟方式下，盖板上方的自然排烟口排烟效率与开洞率呈二次函数关系，当开洞率达到4.73%时，盖板上方的自然排烟口排烟效率可达到最大；在组合排烟方式下，自然排烟区域和机械排烟区域之间的挡烟垂壁高度增加至2.5 m，基本可以将火灾烟气控制在着火区域一侧；机械排烟区域发生火灾时，采用羽流模型计算机械排烟量，组合排烟方式能够有效控制火灾烟气。
To explore a reasonable design scheme of smoke exhaust system of the throat area in metro depot with over development, the key parameters and smoke control effect of natural smoke exhaust mode and combined smoke exhaust mode were studied by using the method of theoretical analysis and numerical simulation based on the basic theory of fire science and fluid mechanics. The results showed that: under the natural ventilation condition, it is two times function between the smoke exhaust efficiency with the opening rate of the cover, the natural smoke exhaust efficiency of the exhaust ports on the cover reaches the maximum when the opening rate reached 4.73%. Under the combination exhaust condition, when the height of smoke screen between the natural ventilation area and the mechanical exhaust area increased to 2.5 m, the smoke would be controlled within the fire area. When fire occurred in the mechanical exhaust area, the smoke would be controlled effectively under the combined exhaust mode with the mechanical smoke exhaust volume calculated by using plume model