Design And Optimization Of Anti-snow Device For Bogie Of High Speed Train

In recent years,China’s high-speed railway is gradually developing in the direction of higher operation speed,longer continuous operation time and wider operation area.However,most of the northern regions of China are located in the alpine zone,and the train must overcome the complex weather conditions such as rain,snow and low temperature when running.The bogie area located at the bottom of the car body is easy to snow,which brings great security risks to the safe operation of the train.Therefore,the snow problem in the bogie area of the alpine EMU has always been the focus of the railway operation departments at home and abroad.Based on the three-dimensional unsteady incompressible N-S equation and discrete phase model,this paper takes the bogie of a high-speed train as the research object,simulates the snow problem in the bogie area when the high-speed train is running in the wind and snow environment,obtains the snow reason by analyzing the velocity streamline,pressure nephogram and snow particle trajectory in the bogie area,and studies the train running speed and snow particle trajectory On this basis,the anti snow device is designed and optimized.Finally,the flow field of the bogie is optimized by adding a deflector in the bogie area based on the flow field synergy principle.(1)By analyzing the velocity field,pressure field and motion characteristics of snowflake particles in the bogie area,it is found that a large number of low-speed vortices are formed in the bogie area due to the train wind generated during train operation,which leads to the accumulation of snowflake particles near the low-speed vortices when they enter the bogie with the high-speed air flow at the bottom.(2)In alpine conditions,the influence of high-speed train running speed,snowflake particle diameter and density on bogie snow cover is studied.It is found that with the increase of train speed,the snow cover in bogie area changes greatly.In a certain range,when the train running speed is 200 km / h,the total volume of bogie snow is the most,and when the train running speed is 300 km / h,the snow cover is the least.With the increase of diameter and density,the snow on the surface of traction motor,gearbox and other parts first increases and then decreases,while the snow on the surface of air spring decreases.(3)The straight and streamline deflectors are installed at the front and rear ends of the bogie area,and the influence of the deflector height on the snow cover in the bogie area is studied.It is found that the amount of snow in the bogie area is reduced after installing linear and streamlined deflectors at the front end of the bogie,and the greater the deflector’s inclined height is within a certain range,the less the amount of snow in the bogie area.Through the analysis of the flow field in the bogie area after adding the deflector,the scheme of combined deflector with straight front and back flow is proposed to effectively reduce the snow in the bogie area.Based on the principle of flow field synergy,the flow field in the bogie area is optimized by adding a synergy field deflector.Compared with the original model,the amount of snow in the gearbox is reduced by 65.2%,the amount of snow in the traction motor is reduced by 70.5%,the amount of snow in the air spring is reduced by 89.1%,and the total amount of snow in the bogie area is reduced by 83.3%.