列车通过铁路隧道时的数值模拟分析

Numerical Simulation Analysis of Train Passing Through Railway Tunnel

采用Gambit软件建立隧道列车模型,并利用Flunet17.0软件设置了相应的活塞风二维动网格模型,模拟了列车在不同车速下经过铁路隧道时,隧道内部速度场和压力场的动态变化规律。研究结果表明:随着列车经过隧道时速度的增大,所产生的活塞风的风速也就越大;当列车经过监测点的速度越大时,活塞风的风速突降的程度也就越大;列车头部达到隧道入口时,车头处压力骤然增大,列车周围气体压力波动剧烈;列车尾部到达隧道入口时,车尾处压力突然降低,并出现负压。

This paper uses Gambit software to establish a tunnel train model,and uses Flunet17.0 software to set up the corresponding piston wind two-dimensional dynamic grid model,which simulates the dynamic changes of the speed field and pressure field inside the tunnel when the train passes through the railway tunnel at different speeds.law.The research results show that as the speed of the train passing through the tunnel increases,the wind speed of the piston wind generated increases;when the speed of the train passing the monitoring point increases,the wind speed of the piston wind decreases sharply;When the head of the train reaches the tunnel entrance,the pressure at the head of the train suddenly increases,and the gas pressure around the train fluctuates violently;when the tail of the train reaches the tunnel entrance,the pressure at the rear of the train drops suddenly and negative pressure appears.