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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 7    July 2015

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Crosswind stability of high-speed trains in special cuts
ZHANG Jie(张洁), GAO Guang-jun(高广军), LIU Tang-hong(刘堂红), LI Zhi-wei(李志伟)

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

Abstract:Analysis of the aerodynamic performance of high-speed trains in special cuts would provide references for the critical overturning velocity and complement the operation safety management under strong winds. This work was conducted to investigate the flow structure around trains under different cut depths, slope angles using computational fluid dynamics (CFD). The high-speed train was considered with bogies and inter-carriage gaps. And the accuracy of the numerical method was validated by combining with the experimental data of wind tunnel tests. Then, the variations of aerodynamic forces and surface pressure distribution of the train were mainly analyzed. The results show that the surroundings of cuts along the railway line have a great effect on the crosswind stability of trains. With the slope angle and depth of the cut increasing, the coefficients of aerodynamic forces tend to reduce. An angle of 75° is chosen as the optimum one for the follow-up research. Under different depth conditions, the reasonable cut depth for high-speed trains to run safely is 3 m lower than that of the conventional cut whose slope ratio is 1:1.5. Furthermore, the windward slope angle is more important than the leeward one for the train aerodynamic performance. Due to the shield of appropriate cuts, the train body is in a minor positive pressure environment. Thus, designing a suitable cut can contribute to improving the operation safety of high-speed trains.

 

Key words: high-speed train; crosswind stability; cut; pressure distribution; numerical simulation

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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