基于OpenFOAM地铁隧道防火门的活塞风作用时变特性研究

Study on Time Variant Characteristics of Piston Wind Action on Fireproof Doors of Connecting Passages in Subway Tunnel Based on OpenFOAM

为了研究地铁隧道联络通道防火门表面的活塞风压特征,基于OpenFOAM开源软件,建立了地铁隧道三维非稳态流动模拟模型,并使用动网格方法模拟了地铁列车在隧道内的实时运动。通过与既有试验数据的对比,发现该方法能够准确地模拟地铁隧道内的风环境。在此基础上,建立了完整的足尺地铁隧道-联络通道复合模型,分析了不同行车速度、不同联络通道设计和不同测点距离下防火门的表面风压及其周边的流动特征。计算结果表明,联络通道防火门的表面压力对行车速度最为敏感,对联络通道的几何形态不敏感,隧道-列车间的剪切流动对联络通道内部的流动特征影响较小。

In order to study the characteristics of the piston wind pressure on the surface of the fireproof door in the subway tunnel,a three-dimensional unsteady flow simulation model of the subway tunnel was established based on the computational fluid dynamics software OpenFOAM,and real-time movement of the subway train in the tunnel was simulated using the dynamic mesh method.As compared to existing experimental data,this strategy can correctly reproduce the wind environment in the subway tunnel.Based on this,a full-scale subway tunnel-communication passage composite model was built,and the surface wind pressure of the fireproof door and the flow characteristics around the fireproof door were studied under different driving speeds,different connecting passage designs and different measuring point distances.The calculation results show that the surface pressure of the fireproof door of the connecting passage is the most sensitive to the vehicle speed,and is not sensitive to the geometry of the connecting passage.The shear flow between the tunnel and the train has little impact on the flow characteristics within the communication tunnel.