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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2013  >  13(6): 36-46
XI Yan-hong, MAO Jun, GAO Liang, YANG Guo-wei. Load-shedding method based on suction effect to improve wind drag of high-speed train[J]. Journal of Traffic and Transportation Engineering, 2013, 13(6): 36-46.
Citation: XI Yan-hong, MAO Jun, GAO Liang, YANG Guo-wei. Load-shedding method based on suction effect to improve wind drag of high-speed train[J]. Journal of Traffic and Transportation Engineering, 2013, 13(6): 36-46.
shu

Load-shedding method based on suction effect to improve wind drag of high-speed train

  • 1.

    School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China

  • 2.

    Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

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  • Author Bio:

    XI Yan-hong(1980-), female, lecturer, PhD, +86-10-51688339, 06121404@bjtu.edu.cn

  • Received Date: 2013-06-18
  • Publish Date: 2013-12-25
    Abstract
  • In order to improve the safety of train in crosswind, a new method for safety control using suction effect was discussed to control the separation of airflow boundary layers and to decrease the crosswind aerodynamic force on train. Taking CRH high-speed train of China as prototype, the pumping chambers were added in train body, and the outer surface of train was connected with pumping chambers by slots. When train was running at high speed, airflow was sucked into pumping chambers through slots to form suction effect. Analysis result indicates that the installing of pumping chambers and slots can make the pressure inside train lower than its outside airflow pressure when train is running at high speed. The separation of airflow boundary layers can be effectively controlled. The crosswind aerodynamic force on train decreases. Slot inclination angle has significant effect on decreasing crosswind aerodynamic force. When inclination angle is 30°, the decrease of total resistance is 7.21%. The decrease of lateral force is 4.85% for the first vehicle, 2.71% for the middle vehicle, and 90.48% for the last vehicle. The decrease of lift is 8.21% for the first vehicle, 12.56% for the middle vehicle, and 7.69% for the last vehicle. The decrease of overturning moment is 5.29% for the first vehicle, 8.84% for the middle vehicle, and 57.56% for the last vehicle. Slot inclination angle has different effects on the aerodynamic load-shedding rates of different vehicles. The impact of slot inclination angle on the last vehicle is greatest.

     

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