Key Laboratory of Traffic Safety on Track, Ministry of Education, Central South University, Changsha, China.
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha, China.
PLoS One. 2023 Jan 3;18(1):e0279818. doi: 10.1371/journal.pone.0279818. eCollection 2023.
Scenario models of a moving subway train can help investigate the influence of different fire locations on smoke propagation characteristics in curved tunnels. To this end, this study adopts the three-dimensional Unsteady Reynolds Average Navier-Stokes equations method and the renormalization group k-ε two-equation turbulence model with buoyancy correction for numerical analysis. The motion of the train is replicated using the slip grid technique. The results indicate that when a fire breaks out on a moving train in tunnels, the piston wind leads the longitudinal movement of the smoke. If a fire erupts in the head or middle car of a moving train, the time of smoke backflow is delayed by 30 s or 17 s, respectively, compared to that for the tail car. The obtained results provide a theoretical basis for reasonably controlling the smoke flow in subway tunnels and reducing casualties in fire accidents.
移动地铁列车的场景模型有助于研究不同火灾位置对曲线隧道中烟雾传播特性的影响。为此，本研究采用三维非定常雷诺平均纳维-斯托克斯方程方法和带浮力修正的重整化群 k-ε 两方程湍流模型进行数值分析。列车的运动采用滑移网格技术进行复制。结果表明，当列车在隧道中行驶时发生火灾，活塞风会导致烟雾的纵向运动。如果火灾发生在行驶中的列车的车头或中部车厢，与车尾相比，烟雾回流的时间将分别延迟 30 秒或 17 秒。所得结果为合理控制地铁隧道内的烟雾流动和减少火灾事故中的人员伤亡提供了理论依据。
