城际列车过站对屏蔽门风压荷载影响规律研究

Research on the Influence of Wind Pressure Load on Platform Screen Doors Caused by Intercity Train Passing Through Stations

城际铁路列车高速过站引起的风压对屏蔽门施加了较大荷载,为确保屏蔽门安全使用,实现合理设计与建造目标,需探索屏蔽门上风压荷载的分布规律与作用机制。使用Fluent软件,选用RNG k-ε湍流模型,采用有限体积法对控制方程进行离散,采用二阶迎风格式和中心差分格式分别求解对流和扩散通量,开展城际铁路列车过站对屏蔽门风压荷载影响规律研究。研究结果表明:列车高速过站时,封闭区域净空面积的增加使被压缩的空气能够更快消散,从而减小屏蔽门的风压荷载,使屏蔽门所受风压荷载的各项极值减小;列车到达屏蔽门前,屏蔽门距站台边缘退避距离的小幅变化对屏蔽门风压荷载极值的影响不明显;列车到达屏蔽门后,封闭区域内的气流变化和分布更加剧烈和复杂,净空面积的增加,使屏蔽门风压荷载受到屏蔽门退避距离变化的影响更为显著;列车过站速度的提高,将使屏蔽门所受风压荷载极值增加;列车过站过程中,屏蔽门各点荷载极值沿列车行进的方向总体减弱,但在列车过站速度提高时,屏蔽门在沿列车行进方向的末端附近,荷载最小值(吸力)有增加趋势,且速度越快,该现象越明显。

The wind pressure caused by the high-speed passage of intercity railway trains applies a significant load on the platform screen doors,to ensure the safe of the platform screen doors and achieve reasonable design and construction goals,it is necessary to explore the distribution law and mechanism of wind pressure load on the platform screen doors first.Using Fluent software,RNG k-εturbulence model was selected,and the control equations were discretized by finite volume method,the second-order upwind scheme and center difference scheme were used to solve the convective and diffusive fluxes,the influence of wind pressure load on platform screen doors caused by intercity train passing through stations was studied.The research results indicates:When a train passes through a station at high speed,the increase in the ross-section area of the enclosed area allows the compressed air to dissipate faster,thereby reducing the wind pressure load on the platform screen doors and minimizing the extreme values of the wind pressure load on the doors;Before the train arrives at the platform screen door,the slight change in the retreat distance between the platform screen door and the platform edge has little effect on the extreme wind pressure load of the platform screen door;After the train arrives at the platform screen door,the airflow changes and distribution in the enclosed area become more severe and complex,the increase in cross-section area makes the wind pressure load of the platform screen door more significantly affected by the change in the retreat distance of the platform screen door;The increase in train passing speed will lead to an increase in the extreme wind pressure load on the platform screen doors;During the process of the train passing through the station,the maximum load at each point of the platform screen door decreases overall along the direction of the trains travel,however,as the speed of the train passing through the station increases,the minimum load(suction)near the end of the platform screen door in the direction of the trains travel tends to increase,and this phenomenon becomes more pronounced as the speed increases.