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Wind and Structures
  Volume 35, Number 2, August 2022 , pages 83-92
DOI: https://doi.org/10.12989/was.2022.35.2.083
 


Experimental study on the influence of Reynolds number and roll angle on train aerodynamics
Zhixiang Huang, Wenhui Li, Tanghong Liu and Li Chen

 
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 = 0.37x106 to Re = 1.45x106 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.
 
Key Words
    aerodynamics; high-speed train; Reynolds number; roll angle; wind tunnel test
 
Address
Zhixiang Huang:China Aerodynamics Research and Development Center, Mianyang, China 621000, China

Wenhui Li:1)Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering,
Central South University, Changsha 410075, China
2)Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha 410075, China
3)National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha 410075, China

Tanghong Liu:1)Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering,
Central South University, Changsha 410075, China
2)Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha 410075, China
3)National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha 410075, China

Li Chen:China Aerodynamics Research and Development Center, Mianyang, China 621000, China
 

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