Aerodynamic Features of High-Speed Maglev Trains with Different Marshaling Lengths Running on a Viaduct under Crosswinds  

作　　者：Zun-Di Huang Zhen-Bin Zhou Ning Chang Zheng-Wei Chen Su-Mei Wang 

机构地区：[1]School of Rail Transportation,Wuyi University,Jiangmen,529020,China [2]National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch),The Hong Kong Polytechnic University,Hong Kong,999077,China [3]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong,999077,China

出　　处：《Computer Modeling in Engineering & Sciences》2024年第7期975-996,共22页工程与科学中的计算机建模（英文）

基　　金：supported by Wuyi University Hong Kong and Macao Joint Research and Development Fund(GrantsNos.2021WGALH15,2019WGALH17,2019WGALH15);the National Natural Science Foundation of China-Guangdong Joint Fund(GrantsNo.2019A1515111052);the National Natural Science Foundation of China(Grant No.52202426);a grant from the Research Grants Council(RGC)of the Hong Kong Special Administrative Region(SAR),China(Grants No.15205723);a grant from the Hong Kong Polytechnic University(Grant No.P0045325).

摘　　要：The safety and stability of high-speed maglev trains traveling on viaducts in crosswinds critically depend on their aerodynamic characteristics.Therefore,this paper uses an improved delayed detached eddy simulation(IDDES)method to investigate the aerodynamic features of high-speed maglev trains with different marshaling lengths under crosswinds.The effects of marshaling lengths(varying from 3-car to 8-car groups)on the train’s aerodynamic performance,surface pressure,and the flow field surrounding the train were investigated using the three-dimensional unsteady compressible Navier-Stokes(N-S)equations.The results showed that the marshaling lengths had minimal influence on the aerodynamic performance of the head and middle cars.Conversely,the marshaling lengths are negatively correlated with the time-average side force coefficient(CS)and time-average lift force coefficient(Cl)of the tail car.Compared to the tail car of the 3-car groups,the CS and Cl fell by 27.77%and 18.29%,respectively,for the tail car of the 8-car groups.It is essential to pay more attention to the operational safety of the head car,as it exhibits the highest time average CS.Additionally,the mean pressure difference between the two sides of the tail car body increased with the marshaling lengths,and the side force direction on the tail car was opposite to that of the head and middle cars.Furthermore,the turbulent kinetic energy of the wake structure on the windward side quickly decreased as marshaling lengths increased.

关 键 词：High-speed maglev train marshaling lengths crosswinds aerodynamic features 

分 类 号：O22[理学—运筹学与控制论]