Volume 24 Issue 5
Oct.  2024
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2024  >  24(5): 248-258
ZHU Fen-tian, ZHENG Qi-yao, XU Liang-zhong, CHANG Chao, NIU Ji-qiang. Ventilation and exhaust gas diffusion characteristics of power pack for trains running on open lines in wind environment[J]. Journal of Traffic and Transportation Engineering, 2024, 24(5): 248-258. doi: 10.19818/j.cnki.1671-1637.2024.05.016
Citation: ZHU Fen-tian, ZHENG Qi-yao, XU Liang-zhong, CHANG Chao, NIU Ji-qiang. Ventilation and exhaust gas diffusion characteristics of power pack for trains running on open lines in wind environment[J]. Journal of Traffic and Transportation Engineering, 2024, 24(5): 248-258. doi: 10.19818/j.cnki.1671-1637.2024.05.016
shu

Ventilation and exhaust gas diffusion characteristics of power pack for trains running on open lines in wind environment

doi: 10.19818/j.cnki.1671-1637.2024.05.016
  • 1.

    School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    CRRC Zhuzhou Electric Locomotive Co., Ltd., Zhuzhou 412001, Hunan, China

  • 3.

    School of Mechatronics and Vehicle Engineering, East China Jiaotong University, Nanchang 330013, Jiangxi, China

Funds:

National Natural Science Foundation of China 52172359

More Information
  • Author Bio:

    ZHU Fen-tian(1996-), male, doctoral student, 2992307051@qq.com

    NIU Ji-qiang(1988-), male, associate professor, PhD, E-mail: jiqiang_niu@163.com

  • Received Date: 2024-04-27
    Available Online: 2024-12-20
  • Publish Date: 2024-10-25
    Abstract
  • Aiming at the ventilation and exhaust gas diffusion characteristics of diesel locomotive power pack, the steady-state Reynolds time averaged equation and shear stress transport turbulence model were used to simulate the flow field characteristics of diesel multiple units under crosswind condition. The effects of train speed, crosswind, and skirt plates on the ventilation of the power pack and exhaust gas diffusion characteristics on the roof were analyzed. Research results show that the ventilation performance of the power pack is optimal when the train operates without crosswind on an open line. As train speed increases, the exhaust gas concentration at the intake of most fresh air systems of air conditioning on the roof rises. Strong crosswind increases the airflow of fans on the windward side of the power pack, especially for downstream fans of the same power pack. Compared with no crosswind condition, the ventilation rate of the lead car fans can increase by up to 2.35 times, and that of the rear car fans can increase by up to 3.82 times in crosswind. However, the airflow of leeward fans decreases, particularly for the leeward fans of the power pack in the lead car, and even airflow loss occurs. The maximum fan ventilation rate in opposite direction can increase by 1.21 times. Skirt plates can effectively suppress the interference of crosswind on the fan airflow. Under strong crosswind, the fluctuation amplitude of fan ventilation rate of the power pack with skirt pates is limited to 28% compared to that under no crosswind condition. In an environment without crosswind, the maximum increase in exhaust gas concentration at fresh air inlets of air conditioning downstream of the roof exhaust outlets is nearly 80%. Crosswind can effectively reduce the exhaust gas content of most fresh air systems, causing significant difference between windward and leeward inlets. The deflection of exhaust gas due to crosswind significantly reduces and even eliminates the exhaust gas concentration at most fresh air inlets on the roof.

     

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