列车阻塞效应下铁路隧道火灾临界风速研究

针对现有临界风速研究较少考虑隧道内阻塞物或仅讨论隧道内存在小阻塞物的情况，以某一铁路隧道为研究对象，构建铁路隧道列车火灾数值计算模型，分析列车阻塞对铁路隧道临界风速的影响。研究结果表明：无阻塞情况下，本文数值模拟结果与Li模型的吻合度较高；随着阻塞比增加，临界风速呈下降趋势。基于模拟数据分析，修正了临界风速下降率ε和隧道阻塞比φ的对应关系，得到隧道列车火灾临界风速理论模型，并利用已有的隧道火灾实验数据及CFD模拟结果验证了模型的可靠性。

Study on critical velocity for railway tunnel fire smoke control considering the train blockage effect

Abstract: Aiming at the existing critical velocity research, less consideration is given to the obstacles in the tunnel or only the small obstructions in the tunnel are discussed. Taking a railway tunnel as the research object, the numerical calculation model of the train fire of the railway tunnel is constructed, the influence of train blockage on the critical velocity is analyzed. The results show that the numerical simulation results are in good agreement with the Li model under block-free conditions. The increase in the tunnel blockage ratio tends to bring about a decrease in the critical velocities. Based on the simulation data analysis, the correspondence between the critical velocity reduction rate ε and the tunnel blocking ratio φ is corrected, a theoretical model of the critical velocities of railway tunnel train fire is obtained, and the reliability is verified by the existing tunnel fire experimental data and CFD accident simulation results.