Study On Aerodynamics Effect Of Beijing New Airport Underground Station On Beijing-Bazhou High Speed Railway

In recent years,with the development of high-speed railway technology in China,more and more cities begin to build high-speed railway.In order to solve the contradiction between urban residents’ travel demand and land shortage,people began to build underground high-speed railway stations.However,here comes a series of aerodynamic problems involving high-speed railway underground stations.A tiny fault will have an impact on the design of the structure of the station and the safety of passengers.Therefore,it is necessary to study the aerodynamic effect of the high-speed railway underground station in detail.Based on Beijing New Airport Subway Station of Beijing-Bazhou High-speed Railway,this paper uses FLUENT finite element software to simulate the aerodynamic problems of the Subway Station of Beijing High-speed Railway.The main research contents and relevant conclusions are as follows:(1)Relevant theories of aerodynamics and computational fluid dynamics are sorted out and further studied.Based on these theories,boundary conditions are set for simulation calculation.The measured data verifies the numerical calculation and ensures the reliability of the numerical simulation.(2)The basic law of air pressure change in tunnel and underground station is analyzed and summarized when the train enters the tunnel in front of the station.The influence of high-speed train intersection at different locations of underground station on the aerodynamic effect of underground station is simulated.The simulation results show that the pressure wave generated before the train arrives at the station becomes the primary factor causing the aerodynamic pressure of the screen door and its surrounding space to reach the maximum.(3)The protective effect of underground station isolation wall on the aerodynamic effects at platform is studied,and the influence of high-speed train intersecting at different locations on the aerodynamic effects of underground station is simulated.The simulation results show that the aerodynamic effects at the screen door position along the stopping line is affected by the overlapping or counteracting of pressure waves generated by two high-speed trains intersecting in the station.The main influencing factors.Therefore,reasonably control the time lag between the trains which will intersect entering underground stations will minimize the aerodynamic pressure at the screen door position.In this paper,through fine modeling and Simulation of Beijing New Airport underground station of Beijing-Bazhou High-Speed Railway,the influence of underground station structure on high-speed train arrival and train intersection is fully analyzed,and the aerodynamic loads on the screen doors in underground stations under different working eonditions are studied,which provides ideas for the design of screen doors in underground stations.