Study On Aerodynamic Pressure On Platform Screen Doors Of High-speed Subway Passing Through An Underground Station

At present,most subway stations are equipped with platform screen doors(PSDs),which plays an important role in maintaining a comfortable waiting environment and ensuring the safety of passengers.When the train passes through the station at a high speed,the PSD will bear strong aerodynamic load.In order to alleviate the aerodynamic effect of PSD caused by train crossing and ensure the normal and safe operation of PSD,this paper studied the aerodynamic pressure on the surface of PSD in high-speed subway underground station by means of numerical simulation and experimental verification,the factors affecting the aerodynamic pressure of PSD were analyzed,and the pressure relief measures were discussed.In this paper,the numerical model of train passing through the station was established by using FLUENT software and verified by the measured data of Shenzhen Metro Line 11.The subsequent simulation research was carried out on the basis of ensuring the accuracy of the model.The simulation condition included 5 train speeds,3 vehicle types,3 section shapes of interval tunnel,5 distances between PSD and train,3 opening and closing conditions of piston shaft and 2 distances between the shaft at the entrance end of the station and PSD.The simulation results show that when the shafts at both ends of the station are opened,the peak pressure basically decreases along the length of the PSD and maintains constant along the height direction,and the most unfavorable position of the PSD’s pressure appears at about 20 m away from the entrance of the PSD.The maximum peak pressure and pressure amplitude on the PSD are approximately proportional to the square of the train speed.When different types of train pass through an underground station at 120 km/h,the peak positive pressure of the PSD under commuter type D vehicle is 34% higher than that of commuter type B vehicle,and when the train type is commuter type D vehicle,the pressure of PSD is the most unfavorable.The crosssectional shape of interval tunnel has little effect on the PSD’s pressure.There is a nonlinear relationship between the maximum peak pressure and pressure amplitude of the PSD and the distance between PSD and the train.When relieving the PSD’s aerodynamic pressure by increasing the distance between PSD and the train,it is recommended that the distance should not exceed 0.25 m.Additionally,when the piston shaft at the entrance of the station is opened and the piston shaft at the exit is closed,the pressure of PSD is the most unfavorable.Changing the distance between the shaft at the entrance of the station and the PSD has little effect on the pressure relief of the PSD.The research of this paper can provide reference for the strength design and normal operation of PSD in high-speed subway station...