Numerical Investigation on Aerodynamic Drag and Noise of Pantographs with Modified Structures

Document Type : Regular Article

Authors

1 School of Engineering Sciences University of Chinese Academy of Sciences, Beijing, 100049, China

2 Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

3 CRRC Qingdao Sifang Co., Ltd., Qingdao, Shandong, 266111, China

4 International Academy of Aviation Industry, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand

Abstract

It is well known that the pantograph, which works as a complex component of high-speed trains, is an important source of aerodynamic drag and aerodynamic noise of a high-speed train (HST) that can affect HST performance, comfort for passengers, and quietness of nearby communities. Thus, comprehensive studies on aerodynamic characteristics including aerodynamic drag and aerodynamic noise obtained by the pantograph need to be conducted. This work presents the aerodynamic characteristics including aerodynamic resistance and aerodynamic noise generated by the prototype pantograph of a high-speed train running at a speed of 300 km/h using numerical techniques of improved delayed detached-eddy simulation (IDDES) and acoustic finite element method (FEM). Then, the structure of the original pantograph is modified by wrapping the insulators, and the base frame, so that aerodynamic resistance and aerodynamic noise may be reduced as expected. Numerical results obtained from the pantograph without modification, with two modifications to the original design i.e. the base frame, and the insulators, are discussed. Compared to the original pantograph, the two modifications of the pantograph at the base frame and the support insulators are conducive to reducing the aerodynamic drag of the pantograph. However, the results also show that the modified insulator may not achieve considerable success in noise reduction. Only the modified base frame shows that noise is reduced significantly. Therefore, this suggests that the pantograph with base frame modification is a better choice for resistance and noise reduction.

Keywords

References

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Journal of Applied Fluid Mechanics
Volume 15, Issue 2 - Serial Number 63
March and April 2022
Pages 617-631

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History

  • Received: 02 April 2021
  • Revised: 26 July 2021
  • Accepted: 23 August 2021
  • Available online: 04 February 2022

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