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地铁火灾时的烟气流动属湍流流动,采用CFD对地铁火灾时烟气流动的规律进行数值模拟时需要确定相关的边界条件和适用的湍流模型。通过对既有的北京地铁一、二号线的一个典型车站冷烟状况的现场测试,获得了有参考价值的数据,并且建立了CFD模型。CFD模拟结果与测试数据的比较表明,所选的湍流模型能正确模拟复杂的地铁火灾烟气流动规律。
The flue gas flow in subway fire is a turbulent flow. When using CFD to simulate the law of flue gas flow in subway fire, it is necessary to determine the relevant boundary conditions and applicable turbulence model. Through field testing of the cold smoke status of a typical station on Beijing Metro Line 1 and Line 2, valuable data were obtained and a CFD model was established. The comparison between CFD simulation results and test data shows that the selected turbulence model can accurately simulate the complex law of smoke flow in subway fire.