Volume 23 Issue 3
Jun.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(3): 148-161
XIONG Xiao-hui, WANG Xin-ran, ZHANG Jie, WANG Kai-wen, CHENG Fan, LUO Zhang-jun. Effect of lift airfoils on characteristics of slipstream and wake flow of high-speed trains[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 148-161. doi: 10.19818/j.cnki.1671-1637.2023.03.011
Citation: XIONG Xiao-hui, WANG Xin-ran, ZHANG Jie, WANG Kai-wen, CHENG Fan, LUO Zhang-jun. Effect of lift airfoils on characteristics of slipstream and wake flow of high-speed trains[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 148-161. doi: 10.19818/j.cnki.1671-1637.2023.03.011
shu

Effect of lift airfoils on characteristics of slipstream and wake flow of high-speed trains

doi: 10.19818/j.cnki.1671-1637.2023.03.011
  • 1.

    Key Laboratory of Traffic Safety on Track of Ministry of Education, Central South University, Changsha 410075, Hunan, China

  • 2.

    Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University, Changsha 410075, Hunan, China

  • 3.

    National and Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Central South University, Changsha 410075, Hunan, China

Funds:

National Key Research and Development Program of China 2020YFA0710903

More Information
  • Author Bio:

    XIONG Xiao-hui(1978-), male, professor, PhD, xhxiong@csu.edu.cn

  • Received Date: 2022-12-13
    Available Online: 2023-07-07
  • Publish Date: 2023-06-25
    Abstract
  • A 1∶10 three-car CRH high-speed train model was taken as the research object to explore the drastic change of the flow field around the high-speed train caused by the installation of lift airfoils on the roof. An improved delayed detached eddy simulation (IDDES) method based on the two-equation turbulence model was adopted to analyze the development tendencies of the time-averaged and instantaneous slipstreams of two high-speed trains with and without lift airfoils. The distribution characteristics of instantaneous vortex structures in the wake region were discussed by a vortex identification method. The correlation between the peak slipstream velocity and unsteady characteristics of wake vortices was verified by the comparison of the slipstream distribution characteristics at different flow positions in the wake region and the movement laws of wake vortices. The power spectrum density curves of the velocity in the wake region were obtained by means of the spectral analysis. Research results show that due to the geometric structure of lift airfoils, the boundary layer separation on the train surface is intensified, and the thicknesses of the boundary layers on the roof and side surfaces of the train increase. The peak slipstream velocity is raised by the lift airfoils. Specifically, the maximum time-averaged slipstream velocities at the trackside and platform position increase by 1.556 and 1.327 times, respectively. It is delayed compared with the second peak position of the traditional train. Due to the continuous development and accumulation of wing-tip vortices downstream, the wake flow structure of the train with lift airfoils is manifested as a large-scale vortex pair mixed with a pair of more broken small vortices. Compared with the traditional train, the shear effect between the vortex and the ground is stronger, the time-averaged slipstream velocity of the wake flow of the train with lift airfoils is larger in the spanwise distribution but smaller in the vertical distribution. Moreover, there is a more obvious shear separation on the horizontal plane. Many small-scale broken vortices are incorporated in the wake of the train with lift airfoils, affecting the shedding frequency of vortices in the wake. As a result, compared with the traditional train, the train with lift airfoils has higher energy and slower vortex dissipation velocity.

     

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