Aerodynamic Simulation And Experimental Study Of High-speed Train Passing Through Station

With the development of high-speed railway in China,the wind caused by the high-speed train passing the station will threaten the safety of the people on the platform.The platform safety protection device can effectively reduce the impact of the wind on the platform and improve passenger waiting comfort.After the platform is equipped with platform safety protection device,the transient pressure generated by the train passing through the station at high speed will impact it.It is of great significance to grasp the reasonable installation distance between the platform safety protection device and the track line for the structural strength of the platform door,saving the platform space and reducing the impact of the train wind on passengers.In order to analyze the influence of train passing through the station on platform door,numerical simulation and line test are combined in this paper.Firstly,three-dimensional train-station models and grid models with the platform safety protection device are established.The sliding mesh technology is used to simulate the train passing through station.The flow field distribution in the station,the influence of wind pressure on platform door at different positions and the wind speed of different positions are analyzed.Then,in order to analyze the influence of four factors which include the speed,the distance of the platform door,train models and the structure of canopy on the wind pressure of platform door,the station model was established and the simulation of the train passing through the station at different speeds was carried out.Finally,the wind load and structural deformation tests of platform door are carried out at elevated ground station and underground high-speed railway station.The test and simulation results are compared and verified.The research shows that the passing of train rear is most unfavorable to the platform door,and the entrance platform door is the most affected.The influence of the wind pressure on the far side of the platform door is far less than that on the near side of the platform door when the main line is set with two tracks.The wind load on the surface of the platform door is directly proportional to the crossing speed and inversely proportional to the distance between the door and the edge of the platform.The good streamline of the train head can effectively reduce the influence of wind pressure on the platform door.When the train passes the station at high speed,the influence of canopy structure on the wind pressure of the platform door cannot be ignored.Affected by the pressure relief space,the wind load on the surface of the platform door of the underground platform is much greater than that of the platform door of the ground platform.The simulation and experimental results show that the trend of the deformation curves is basically the same,which verifies the correctness of the numerical simulation method.According to the industry standard of “platform door system of intercity railway”,the surface wind load of platform door under simulation condition meets the design requirements,and the structural deformation of platform door under wind load meets the design requirements.Though the study of the flow field,wind pressure distribution and wind speed when the train passes the station,the distribution law is summarized,which provides theoretical reference and practical basis for the setting of platform safety protection device.