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[2022-Vol.19-Issue 3]The Effect of Concave Size on the Aerodynamics of a Maglev Train
Post: 2022-04-30 16:38  View:103

Journal of Bionic Engineering (2022) 19:709–723 https://doi.org/10.1007/s42235-022-00158-4 

The Efect of Concave Size on the Aerodynamics of a Maglev Train 

Shuang Meng1,2,3 · Dan Zhou1,2,3 · Changda Tan1,2,3 

1 Key Laboratory of Trafc Safety on Track (Central South University), Ministry of Education, Changsha 410075, China
2 Joint International Research Laboratory of Key Technology for Rail Trafc Safety, Changsha 410075, China
3 National and Local Joint Engineering Research Center of Safety Technology for Rail Vehicle, Changsha 410075, China

Abstract  Inspired by shark’s skin in nature, a non-smooth surface could be an ideal model for changing the fow characteristics of fuids on the object surface. To analyze the efect of a non-smooth surface with concaves on the maglev train aerodynamic performances and to investigate how the concave size afects the aerodynamic forces and fow structure of a maglev train, four 1/10th scaled maglev train models are simulated using an Improved Delayed Detached Eddy Simulation (IDDES) method. The numerical strategy used in this study is verifed by comparison with the wind tunnel test results, and the comparison shows that the diference was in a reasonable range. The results demonstrate that the concaves could efectively reduce the tail car pressure drag, thus reducing the total drag, and that the smaller the concave size was, the better the drag reduction efect would be. The change in the lift with the concave size was more signifcant than that of the drag, and the tail car lift of R1 (0.0012H), R2 (0.0024H), and R3 (0.0036H) train models was 30.1%, 43.0%, and 44.5% less than that of the prototype, respectively. In addition, diferent fow topologies of the wake are analyzed. The width and height of the vortex core of the counter-rotating vortices tended to decrease with the concave size. Thus, from the point of view of ensuring the operating safety of a maglev train, a non-smooth surface with small-size concaves is recommended. 

Keywords  Maglev train · Aerodynamic characteristics · Concave · Numerical simulation

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Maglev train model. a Three-dimensional view; b front view

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