A numerical study of snow accumulation on the bogies of high-speed trains based on coupling improved delayed detached eddy simulation and discrete phase model

Abstract

A numerical simulation method based on the improved delayed detached eddy simulation coupled with a discrete phase model is used to study the influence of the snow on the performance of bogies of a high-speed train running in snowy weather. The snow particle trajectories, mass of snow packing on the bogie, and thickness of snow accumulation have been analyzed to investigate the flow mechanisms of snow accumulation on different parts of the bogies. The results show that the snow accumulation on the first bogie of the head vehicle is almost the same as that of the second bogie, but the total accumulated snow on the top side of the second bogie is more than 74% higher than that of the first bogie. Among all the components of the bogies, the motors were found to be strongly influenced by the snow accumulation. The underlying flow mechanisms responsible for the snow accumulations are discussed.

Numerical Study on the Anti-Snow Performance of Deflectors on a High-Speed Train Bogie Frame

“…The forces acting on one particle include gravity, virtual mass force, shear lift force and pressure gradient force, while the other forces can be ignored. (Liu et al 2018) The motion equations of the particle are presented as Eq.…”

“…5. According to references (Nemoto et al 2004;Sang et al 2012;Liu et al 2018;Gao et al 2018a), the mass flow rate of snow particles is set as 4 kg/s, the diameter is 2×10 -4 m, and the density is 100 kg/m 3 . The boundary condition of the particle is set to trap condition.…”

“…Gao et al (2018b) studied the distribution characteristics of snow accumulation on the bogie surface of high-speed train under the condition of crosswinds, and studied the influence of fairing height on the amount of snow particles in each component. Liu et al (2018) used the IDDES and DPM discrete phase to simulate the train running in snowy environment. Besides, the characteristics of particles in the bogie region and the mass of particles on different parts were studied.…”

A review of snow melting and de-icing technologies for trains

“…The movement of snow particles around the brake clamps of bogie at 2s time. 59 the method was validated by comparing the computational results.…”

“…5 Large amounts of attached ice and snow can severely affect the maintenance of train sets by leaving hidden dangers. 4 As mentioned above, these events lead to higher operating costs, 6 lower transportation efficiency 7 and a more dangerous operating environment. 8,9 Therefore, researchers have thoroughly studied the icing principles on each part of trains.…”