Influence of moving boundary conditions on the motion characteristics of wind and snow in the bogie regions of alpine high-speed trains
The unsteady Reynolds-averaged Navier-stokes(URANS)method based on the Realizable k-εturbulence model and the discrete phase model(DPM)were employed to investigate the influence of motion boundaries on the aerodynamic characteristics and snow distribution in the steering gear area of high-speed trains.The results show that the movement of the ground effectively mitigates the flow kinetic energy attenuation effect underneath the steering gear,which significantly increases the flow velocity distribution in the steering gear zone 2 and affects the vertical velocity distribution of snow particles.This leads to a 33.6%reduction in the snow mass on the surface of steering gear 1 and a 20.1%increase in the snow mass on the surface of steering gear 2.The rotation of the train wheelsets does not impact the snow distribution on the bottom surface of the steering gear,but it causes a significant increase in the vertical velocity of snow particles around the rear end plate,and thereby increases the snow distribution on the upper surface of the steering gear.Compared to rotating wheelsets,stationary wheelsets reduce the snow masses on the traction motor,gearbox,frame and rear end plate surfaces by 1.5%,2.9%,3.4%and 6.4%,respectively,resulting in an overall 3.2%decrease in the total snow mass on the surface of steering gear 2.Therefore,in the numerical simulation and wind tunnel experiments of snow accumulation in the steering gear area of high-speed trains,it is essential to achieve the relative motion between the steering gear,ground,and wheelsets as accurately as possible.
high-speed trainbogie regionwind and snow flowmoving boundarynumerical simulation
国家科技期刊平台
NSTL
万方数据
