Wind and Structures

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Experimental study on the influence of Reynolds number and roll angle on train aerodynamics

  • Huang, Zhixiang (China Aerodynamics Research and Development Center) ;
  • Li, Wenhui (Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University) ;
  • Liu, Tanghong (Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South University) ;
  • Chen, Li (China Aerodynamics Research and Development Center)
  • Received : 2021.12.01
  • Accepted : 2022.07.06
  • Published : 2022.08.25
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Abstract

When the rolling stocks run on the curve, the external rail has to be lifted to a certain level to balance the centrifugal force acting on the train body. Under such a situation, passengers may feel uncomfortable, and the slanted vehicle has the potential overturning risks at high speed. This paper conducted a wind tunnel test in an annular wind tunnel with φ=3.2 m based on a 1/20th scaled high-speed train (HST) model. The sensitivity of Reynolds effects ranging from Re = 0.37×106 to Re = 1.45×106 was tested based on the incoming wind from U=30 m/s to U=113 m/s. The wind speed covers the range from incompressible to compressible. The impact of roll angle ranging from γ=0° to γ=4° on train aerodynamics was tested. In addition, the boundary layer development was also analyzed under different wind speeds. The results indicate that drag and lift aerodynamic coefficients gradually stabilized and converged over U=70 m/s, which could be regeared as the self-similarity region. Similarly, the thickness of the boundary layer on the floor gradually decreased with the wind speed increase, and little changed over U=80 m/s. The rolling moment of the head and tail cars increased with the roll angle from γ=0° to γ=4°. However, the potential overturning risks of the head car are higher than the tail car with the increase of the roll angle. This study is significant in providing a reference for the overturning assessment of HST.

Keywords

Acknowledgement

The authors acknowledge the experimental support provided by the China Aerodynamics Research and Development Centre (CARDC). This work was supported by the National Railway Administration of China (Grant No. 18T043; No. 2018Z035) and the Fundamental Research Funds for Central South University Central Universities (Grant No. 2021zzts0170).

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