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中南大学学报(自然科学版)

Journal of Central South University

第42卷    第4期    总第200期    2011年4月

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文章编号:1672-7207(2011)04-1150-06
青藏线棚车在强横风下的倾覆稳定性
高广军,段丽丽,苗秀娟

(中南大学 交通运输工程学院,轨道交通安全教育部重点实验室,湖南 长沙,410075)

摘 要: 采用缩比棚车模型风洞实验的方法研究棚车在5 m高路堤和15 m高桥梁上的气动性能,得到气动力系数与侧滑角之间的关系,在此基础上,根据静力矩平衡原理建立棚车整车在轨道上倾覆及车体在转向架上倾覆的数学模型,得到车辆在直线和曲线上运行时车辆运行车速和临界倾覆风速关系。研究结果表明:路堤或桥梁上棚车的气动力系数均随着侧滑角的增大而增大,在桥梁上侧滑角为75°时达到最大值,之后稍微降低;车体在转向架上倾覆时的临界风速小于车辆整车在轨道上倾覆的临界风速,车辆的安全速度限值应当以车体在转向架上倾覆为基础进行研究;车辆在曲线上静止时,其在路堤和桥梁上的临界倾覆风速分别为37.0和39.5 m/s,当车速为100 km/h时,其临界倾覆风接近30 m/s;若车辆在直线上静止时,其在路堤和桥梁上的临界倾覆风速分别为45.0和49.0 m/s,当车速为120 km/h时,在路堤或桥梁上棚车的临界倾覆风速接近33 m/s。

 

关键字: 棚车;倾覆稳定性;风洞试验;气动性能;横风

Overturning stability of box-car on Qinghai—Tibet railway line
with strong cross wind
GAO Guang-jun, DUAN Li-li, MIAO Xiu-juan

Key Laboratory of Traffic Safety on the Track of Ministry of Education,
School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China

Abstract:Scaled model and wind tunnel test were used to research on the aerodynamic performance of the box-car on   5 m high embankment and 15 m high bridge, and the relationship between the aerodynamic coefficients and the side sliding angle was gotten. Based on this, math models were built of the whole train overturning on the track and the car-body overturning on the bogie according to static moment balance, and the relationship between running speed and critical overturning wind speed was also gotten when they are running on straight and curve lines. The results show that the aerodynamic coefficients of the whole train increase with the increase of side sliding angle, and reach the maximum when the side sliding angle reaches 75° and decrease a little while on bridge. The critical wind speed of car-body overturning on bogie is less than that of train overturning on track, so train speed regulation should be based on car-body overturning on bogie. If train stays on a curve embankment or bridge, the critical wind speeds are 37.0 and 39.5 m/s separately, and if train speed is 100 km/h, the critical wind speed is near 30 m/s. If train stays on a straight embankment or bridge, the critical wind speeds are 45.0 and 49.0 m/s separately. If train speed is 120 km/h, the critical wind speed is near 33 m/s.

 

Key words: box-car; overturning stability; wind tunnel test; aerodynamic performance; cross wind

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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