Study of Snow Accumulation on a High-Speed Train’s Bogies Based on the Discrete Phase Model

Abstract

During winters, the high-speed train travels in the northern of China is struck by to the snow, ice and coldness, massive snow accumulating on the bogies. To understand the cause of snow packing on the highspeed train's bogies clearly, the 3-D unsteady Reynolds-averaged Navier-Stokes equations with a RNG double-equations turbulence model and a DPM discrete phase model were used to investigate the flow field carried snow particles in a single high-speed train bogie region and monitor the movement of snow particles. And, the numerical simulation was verified by the wind tunnel test. The results show that when air flows into the region, the airflow will rise and impact on the wheels, brakes, electromotors and other parts of bogie regions. The snow particles will follow the air, while the air direction changes sharply the particles will keep the movement due to the inertia. Afterwards, the snow packs on the bogie. In front of the bogies the streamlines of the air and the particle path lines are basically the same. However, due to the inertia of mass particles, the following characteristics of the snow particles with the air are not obvious in the bogie leeward side. Different structures of the end plates will affect the snow accumulation in the bogie regions.

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

“…To verify the accuracy of three-dimensional transient RANS method and Lagrangian particle phase used in the simulation of wind-snow two-phase flow in bogie region, some experiments have already been carried out. Xie et al (2017) and Wang et al (2018a, b) have accomplished two-phase wind tunnel tests, in which the pressure and velocity values at specific points are in good agreement with the numerical simulation results. Besides, Gao et al (2018a) conducted the wind tunnel tests using a 1:2 scaling model to measure the bogie region flow directions with the tuft method which validated the numerical simulation.…”

“…In addition, they also proposed the diversions front end and rear most end of the bogie region and explored the anti-snow performance of the diversions. Xie et al (2017) studied the characteristics of flow field and snow covering around the bogie region, and verified the numerical simulation through experiments. By analyzing the similarities and differences of snow distribution on bogie surface under different working conditions, the performance of deflectors installed at front and rear ends of bogie cavity was obtained.…”

“…According to the literatures Wang et al 2018b;Xie et al 2017), particles and airflow move forward smoothly in the early stage of the simulation. When the airflow passes through the middle and rear region of the bogie, the complex geometry of the bogie causes particles to rise with the airflow, and then particles are gradually spread over the bogie region.…”

“…Once snow particles adhered to the bogie surface, the snow will become more and more serious. (Xie et al 2017) However, bogie is an important part of high-speed train running gear related to the braking and running comfort. The accumulated snow can deteriorate performance of brake clamp, normal movement of air spring, heat dissipation of motor and normal operation of gear box (Kloow 2006，Bettez 2011.…”

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

“…So, the DPM is a good choice to solve this gas-solid two-phase flow problem (Ansari, Goharrizi, Jafari, & Abolpour, 2015;Kosinski & Hoffmann, 2007;Pankajakshan, Mitchell, & Taylor, 2011;Zhou, Mo, & Cen, 2011). Zhou, Flamant, Gauthier, and Lu (2004), Wan, Peng, Xie, Zhang, and Huang (2013), Ma, Liu, Li, Huang, and Su (2015), Liu et al (2015), Oh, Choi, and Kim (2015), Guizani, Mokni, Mhiri, and Bournot (2014), Baghdar Hosseini, Haghighi Khoshkhoo, and Javadi Malabad (2017), Xie et al (2017) and Gao (2018a, 2018b) used the DPM to simulate the motion of particles in the airflow, and the simulation results were in accord to their experiment results. Therefore, it is reasonable to use the DPM method to research the movement of dust particles in the settling chamber.…”