Effect of Aerodynamic Wings on Lift Force Characteristics of High-Speed Maglev Train

DAI Zhiyuan; LI Tian; ZHANG Weihua; ZHANG Jiye

doi:10.3969/j.issn.0258-2724.20210855

Volume 57 Issue 3

Jul. 2022

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Journal of Southwest Jiaotong University > 2022 > 57(3): 498-505.

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DAI Zhiyuan, LI Tian, ZHANG Weihua, ZHANG Jiye. Effect of Aerodynamic Wings on Lift Force Characteristics of High-Speed Maglev Train[J]. Journal of Southwest Jiaotong University, 2022, 57(3): 498-505. doi: 10.3969/j.issn.0258-2724.20210855

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Effect of Aerodynamic Wings on Lift Force Characteristics of High-Speed Maglev Train

doi: 10.3969/j.issn.0258-2724.20210855

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 02 Nov 2021
Rev Recd Date: 28 Dec 2021
Publish Date: 14 Jan 2022

Abstract

Abstract

Maglev trains are subjected to great aerodynamic lift force when running at high speeds, especially the tail car, which may deteriorate the suspension performance and even cause the suspension control system to fail. All these will affect the ride comfort and operation safety of high-speed maglev trains. Therefore, it is urgent to study and improve the lift force characteristics of the tail car of high-speed maglev trains. To this end, a numerical simulation of the high-speed maglev train is carried out in comparison with a wind tunnel test, and the surface pressure coefficient of the train obtained through numerical simulation is in good agreement with the wind tunnel test results. Then, aerodynamic wings (aero-wings) are installed to improve the aerodynamic lift force performance of the tail car, and the influence of the angle and number of the aero-wings on the aerodynamic characteristics of the tail car is studied. The results show that the aerodynamic lift force of the wing decreases with the increase of angle when only one is installed, but the aerodynamic lift force of the tail car decreases first and then increases. Moreover, the lift force of the tail car is the smallest when the aero-wing angle is 12.5°. Compared with the original maglev train, the aerodynamic lift force coefficient of the winged train is reduced by 3.9%, while the resistance of the aero-wing and the tail car is slightly increased. On the basis that the tangent angle between the aero-wing and the car body remains unchanged, multiple 12.5° aero-wings are installed on the tail car. The aerodynamic resistance of the aero-wings at different positions is basically the same, and the aerodynamic resistance of the tail car increase as the number of aero-wings increases. However, the aerodynamic lift force of the aero-wing at different positions is different, which decreases toward the tip of the nose. The aerodynamic lift force of the tail car first decreases with the increase of the aero-wing number and then stabilizes. Finally, the aerodynamic performance of the maglev train with two aero-wings is found relatively better. Compared with the original maglev train, the aerodynamic lift force of the tail car is reduced by 4.6%, and the resistance of the whole vehicle is only increased by 1.4%.
- high-speed maglev train,
- aerodynamic wing,
- aerodynamic lift force,
- numerical simulation

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References

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