Study On Pneumatic Effect Of Screen Door Of Underground High Speed Railway Platform

With the economic development of our country,the development of high-speed railway is advancing by leaps and bounds,and the three-dimensional traffic has prompted the underground high-speed railway station to appear gradually.The aerodynamics effect caused by the high speed passing through the underground station is particularly obvious,which has adverse effects on the safety,economy and comfort of passengers in the station,and is a key technical problem to be solved in the design of the underground high-speed railway station.This paper is based on a three-dimensional,unsteady,incompressible,viscous N-S equation and a two-equation model of k-? for numerical simulation calculations.Taking the underground high-speed railway station of Beijing Daxing International Airport as the engineering background,a three-dimensional numerical model is established,and the sliding mesh technology is used to simulate and calculate the various aerodynamic pressure parameters generated by the train passing through the underground station at high speed.When a high-speed train passes through an underground station,the train length(200m and 400m),the speed of the train(250km / h,300 km / h,350 km / h,400 km /h),and the state of the train crossing(constant-speed rendezvous and unequal-speed rendezvous)are changed.With equal parameters,the wind pressure distribution law of the screened door of the platform and the time history curve of the measured point pressure are analyzed to obtain the distribution law of its aerodynamic effect.The research results show that:(1)The larger the train length,the greater the maximum positive and negative pressure values,the maximum pressure difference values,and the maximum pressure gradient values of the shield door of the underground platform,the worse the aerodynamic comfort,and the more obvious the aerodynamic effect;(2)With the increase of train speed,the values of the various aerodynamic pressure parameters of the shield door of the underground platform gradually increase,the worse the aerodynamic comfort,the more significant the aerodynamic effect;(3)When the train meets at the same speed and different speed,the greater relative intersection speed,the larger value of the term aerodynamic pressureparameter,the worse the aerodynamic comfort,and the more significant the aerodynamic effect;(4)The length of the underground platform,the various aerodynamic pressure parameters in the middle of the platform are larger,the aerodynamic comfort is poor,the aerodynamic effect is significant,and the aerodynamic effects at both ends of the platform smaller.