Research On Anti-snow In The Bogie Region Of High-speed Train Using Shape Optimization

When high-speed trains are driven in low-temperature and snowy environments,a large amount of snow accumulation is likely to form in the bogie region,which seriously affects the safety of trains,and also brings great trouble to the operation and maintenance of trains.Therefore,the study on snow-proof performance in the bogie region is more and more important.In this paper,numerical calculation method is used to study the flow field structure and particle flow characteristics in the bogie region of high-speed trains.Firstly,based on three-dimensional unsteady incompressible Navier-Stokes equations,k-ω SST two-equation turbulence model and Lagrangian particle model,this paper adopts finite volume method and STAR-CCM+,a commercial software,to simulate and calculate the flow field structure and particle flow characteristics in the bogie region.Calculation results demonstrate that the particle flow trajectory in the bogie region is similar to the air flow trajectory.Both of the flows detour from the rear end wall and the mid-end position of the frame to the bogie region and form a round flow which flow out from the bottom of the skirt boards and the front of the bogie region.Therefore,the snow-prevention performance of the bogie region can be effectively improved by optimizing the flow field structure of the bogie region.Based on the above ideas,the optimal design for the snow-prevention performance of the high-speed train bogie region was selected based on the optimized design of the bottom profile of the car body,the outer shape of the skirt boards,and the inclination angle of the bogie front and rear walls.The main tasks to achieve this goal include:1.For the optimal design,a triangular and an arc-shaped bottom model of the train were designed.The author numerically simulated those two models by using a Lagrange particle model,to obtain the snow-prevention performance of the triangular bottom model with an increase of 37.83%,and the arc-shaped bottom model with an increase of 29.35%,so the shape of the triangular model is better.2.Three kinds of apron model,non-skirt model,1/4 skirt model and 3/4 skirt model were designed.Compared with the original model,the snow-proof performance of thenon-skirt model is increased by 39.74%,the 1/4 skirt model,s increased by 30.83%,and the3/4 skirt model is deteriorated by 48.14%.The non-skirt model has the best snow-prevention performance.So it can be concluded that the lower height of bogie region skirts,the snow-prevention performance of the model bogie region is better.3.A 0-degree partition model,a 15-degree partition model,and a 30-degree partition model were designed for the bogie region partition angle,and calculate the flow field and particle characteristics.A conclusion can be draw whether 0 degrees,15 degrees or30-degree partition model has no effect on the snow-prevention performance of the bogie region.4.All of the above,an optimal design for snow-proof performance in the bogie region can integrate the triangular bottom model and the non-skirt model.Compared with the prototype,the triangular bottom-non-skirt model has improved 65.3%.