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VACUUM ›› 2022, Vol. 59 ›› Issue (1): 7-12.doi: 10.13385/j.cnki.vacuum.2022.01.02

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Effect of Tube Cross-Section Shape on Aerodynamic Characteristics of Subsonic Evacuated Tube Maglev System

SONG Jia-yuan, LI Tian, ZHANG Ji-ye, ZHANG Wei-hua   

  1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2021-06-15 Online:2022-01-25 Published:2022-01-27

Abstract: The internal flow field of a subsonic evacuated tube train is complex,and it is important to study the effect of the tube cross-section shape on the aerodynamic properties. Based on computational fluid dynamics(CFD), considering the fluid viscosity and train suspension gap, a three-dimensional aerodynamic model of subsonic evacuated tube train is established. The aerodynamic drag, flow field characteristics and aerodynamic heating effect in 4 different cross-sectional tube are numerical simulated and compared. The results show that when the blockage ratio is constant, the aerodynamic drag of the train in an arched tube is the smallest, and then the circular tube, the largest in the rectangular tube. The pressure gradient in the vertical direction of the circular tube is the smallest, and the pressure on the upper surface of the tube is also the smallest. In the subsonic evacuated tube maglev system, the maximum temperature is shown on both sides of the train bump, and the minimum temperature is on the tube surface. Tube cross-section shape has few effects on the temperature distribution. When the area of the tube cross-section is chosen, the arched tube is prior recommended,and next choice is the circular tube.

Key words: evacuated tube train, tube cross-section shape, aerodynamic forces, pressure, aerodynamic heating

CLC Number: 

  • U171
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