地铁区间隧道火灾情况下的烟气扩散研究

Study on Smoke Propagation in Subway Tunnel with a Fire Scenario

针对地铁区间隧道火灾烟气扩散技术研究难点,利用CFD软件STAR-CCM对郑州地铁一号线某区间隧道进行火灾数值模拟,确定火灾强度为7.5 MW,保证烟气单向扩散临界风速不小于2.0 m/s。实验表明,在隧道火灾发生后,向火源下游逃生的人员应尽量降低自己的高度(比如弯腰前进或匍匐逃离等)沿隧道中线逃离。通过现场试验,将在同种工况下测得的烟气流动状况与数值模拟结果对比,运用更可靠的数值模拟方法模拟火灾烟气流动,其研究结果可为研究烟气流动情况和制定疏散方案提供重要参考依据。

Aiming at the technical difficulties of smoke propagation in subway tunnel with a fire scenario,we conducted the fire simulation of a section tunnel of Zhengzhou Metro Line 1 by using CFD software STAR-CCM.The critical wind speed of one-way diffusion of smoke is not less than 2.0 m/s when fire intensity is 7.5 MW.It is concluded from the simulation analysis that people escaped downstream should try to lower their height and go along the middle line of the tunnel.The gas flow condition measured by field experiment was compared with the numerical simulation results under the same condition.The results show that the numerical simulation method is reliable.The research results provide important reference for studying the flow of smoke and making evacuation plans.