Aerodynamic Characteristics Of Intersections Of Different Types Of High Speed Trains In Crosswind Environment

With the rapid development of high-speed railway,increasing operating speed,make the train affected by the air more and more big,seriously endanger the train operation safety,especially in the side when the wind speed in the environment.At present,there are altogether31 different types of high-speed train sets in China,and it is common for different types of high-speed trains to cross each other on existing lines.Therefore,in order to ensure the safety of high-speed train operation,it is necessary to study the aerodynamic problems of different types of high-speed trains running together in crosswind environment.In this paper,a 300km/h high-speed train and a 350km/h high-speed train are taken as the research objects.Fluent software and dynamic grid technology are used to simulate the outflow field characteristics,surface pressure distribution and aerodynamic characteristics of different types of high-speed trains when they cross in crosswinds and no crosswinds.According to the pressure data of the train surface monitoring points,the change law of the pressure wave when the train passes in the crosswind environment and in the crosswind environment is analyzed,and the influence law of wind speed and wind deflection Angle on the pressure wave is summarized.The variation trend of lateral force coefficient and overturning moment coefficient of the two trains under different wind speeds and different wind Angle is studied.The calculation results show that the full-amplitude of pressure wave of the windward and leeward vehicle increase with the enhance of wind speed.The full-amplitude of pressure wave will also raise with the improve of wind deviation angles,contrast with leeward vehicle.The overturning moment coefficient peak value of leeward vehicle is 7 times of windward vehicle when passing in crosswind condition.Meanwhile,leeward vehicle appears poor lateral stability and becomes more hazardous in above circumstance.Under the influence of crosswind,the overturning moment coefficient peak value of leeward vehicle up to 3.7 times in windless environment.In other words,crosswind advances the overturning possibility of leeward vehicle.While vehicle meeting in different crosswinds,as wind speed and wind deviation angles go up,the higher lateral force coefficient and overturning moment coefficient of windward and leeward vehicle are signed,the higher feasibility of overturning accidents will more occur.