|Table of Contents|

Impact of air flow characteristics underneath carbody on snow accumulation in bogie region of high-speed train(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2019年03期
Page:
109-121
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Impact of air flow characteristics underneath carbody on snow accumulation in bogie region of high-speed train
Author(s):
CAI Lu1;  ZHANG Ji-ye1;  LI Tian1;  AN Chao2
(1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. CRRC Tangshan Co., Ltd., Tangshan 064000, Hebei, China)
Keywords:
high-speed train;  bogie;  detached-eddy simulation;  air flow underneath carbody;  vortex structure;  snow accumulation
PACS:
U270.32
DOI:
-
Abstract:
Aiming at the problem of snow accumulation around the bogie region of high-speed train, the aerodynamics model of the train including refined bogie was established. The detached-eddy simulation was used to simulate the air flow field around the high-speed train at the running speed of 350 km·h-1. The influence of air flow field characteristics on the snow particle transport in the vehicle bottom and bogie region was analyzed. The vortex core lines were extracted, and the relationship between the vortex characteristics of the bogie region and the snow particle transport was studied. Analysis result shows that the underneath air flow is mainly turned upside down from the front and rear wheelsets into the bogie region, forming a swirling air flow around axle. The vorticity in the bottom of bogie region is large than 1 000 s-1, and the vortexes are basically longitudinal. The vorticity in the top of bogie region is less than 200 s-1, and the vortexes are basically longitudinal. The vortexes in the gap between the bogie wheelset and the front/rear end walls are mostly vertical. The vorticity around the back wheelset is more than 5 times larger than that around the front wheelset. The vorticity in the interior region of bogie is less than 200 s-1, and the vortexes are chaotic. The scale, strength and direction characteristics of the vortex reflect that the air flow entering the bogie region has a relative strong ability to carry snow particles, while the outflow of bogie has weaker ability to carry snow particles. The negative pressure in the lower part of head car is large, and there are strong vortexes on both sides of the vehicle bottom and the skirt, which makes it easy to roll up the snow on the track to form snow smoke. Except for head car, the shear stress on the vehicle bottom and the bogie is less than 1 Pa in most areas, and the corresponding frictional wind speed is less than 0.9 m·s-1. The deposited snow particles are difficulty sheared by the internal air flow. 1 tab, 20 figs, 30 refs.

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Last Update: 2019-06-27