Numerical Study on the Effects of Anti-Snow Deflector on the Wind-Snow Flow Underneath a High-Speed Train

Abstract

In order to study the effect of the anti-snow deflector on the wind-snow flow underneath a high-speed train, Detached Eddy Simulation (DES) approach and discrete phase model (DPM) are used to simulate the windsnow flow around the train. The distribution of snow particles underneath the train body is analyzed. Meanwhile, the influence of deflectors on the movement of snow particles around the train is investigated. The results show that lots of vortices shed from the bogie, and the entrainment vortices near the ground actuates the movement of the snow particles on the snow-covered track, which forms a wind-snow flow. The snow smoke around the train develops gradually from the bottom of the first bogie to the end of the tail car. The deflector installed in the front of the bogie will guide the vortices off the bogie region to the ground, which results in flying up more downstream snow particles and correspondingly the number of snow particles accumulated in the bottom of the rear car and around the rear skirt plate is increased. The installation position for the deflector has a certain effect on the snow accretion in the bogie region. When the deflector is installed in the front of the 2nd and 4th bogies, the snow particles captured in the bogie region are reduced by 42.3% and 15.6%, respectively.

Keywords

• high-speed train; bogie; underbody flow; wind-snow flow; discrete phase model; deflector; anti-snow.