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Numerical investigation of the effect of cavity flow on high speed train pantograph aerodynamic noise

Numerical investigation of the effect of cavity flow on high speed train pantograph aerodynamic noise
Numerical investigation of the effect of cavity flow on high speed train pantograph aerodynamic noise
Reducing train pantograph noise is particularly important. In this paper, the flow behaviour and noise contribution of simplified geometries representing high-speed train pantographs and the roof cavity at 1/10th scale are investigated. The Improved Delayed detached-Eddy Simulation (IDDES) turbulent model is used for the flow field simulation and the Ffowcs Williams & Hawkings aeroacoustic analogy is used for far-field noise prediction. The pantograph recess geometry is simplified to a rectangular cavity and two simplified DSA350 pantographs are included. The effect of the pantograph cavity is studied by comparing the flow behaviour and radiated noise from cases with and without the cavity, and also for different train running directions. When the pantographs are installed in a cavity, the shear layer, separated from the cavity leading edge, interacts with the pantographs, and generates large pressure fluctuations on the pantograph surfaces. In comparison with pantographs installed on a flat train roof, the flow around the pantographs with the cavity has different characteristics in terms of the velocity profile upstream of the pantographs. The study shows that the main noise source is from the panhead of the raised pantograph which produces strong tonal noise and this noise source is affected by the cavity flow.
Aeroacoustics, Cavity flow, FW-H, High-speed train, IDDES, Pantograph, Pantograph recess
0167-6105
Kim, Hogun
59edd0de-2b60-4583-a550-424384a76732
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Kim, Hogun
59edd0de-2b60-4583-a550-424384a76732
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5

Kim, Hogun, Hu, Zhiwei and Thompson, David (2020) Numerical investigation of the effect of cavity flow on high speed train pantograph aerodynamic noise. Journal of Wind Engineering and Industrial Aerodynamics, 201, [104159]. (doi:10.1016/j.jweia.2020.104159).

Record type: Article

Abstract

Reducing train pantograph noise is particularly important. In this paper, the flow behaviour and noise contribution of simplified geometries representing high-speed train pantographs and the roof cavity at 1/10th scale are investigated. The Improved Delayed detached-Eddy Simulation (IDDES) turbulent model is used for the flow field simulation and the Ffowcs Williams & Hawkings aeroacoustic analogy is used for far-field noise prediction. The pantograph recess geometry is simplified to a rectangular cavity and two simplified DSA350 pantographs are included. The effect of the pantograph cavity is studied by comparing the flow behaviour and radiated noise from cases with and without the cavity, and also for different train running directions. When the pantographs are installed in a cavity, the shear layer, separated from the cavity leading edge, interacts with the pantographs, and generates large pressure fluctuations on the pantograph surfaces. In comparison with pantographs installed on a flat train roof, the flow around the pantographs with the cavity has different characteristics in terms of the velocity profile upstream of the pantographs. The study shows that the main noise source is from the panhead of the raised pantograph which produces strong tonal noise and this noise source is affected by the cavity flow.

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JWEIA_Manuscript_HogunKim - Accepted Manuscript
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More information

Accepted/In Press date: 15 March 2020
e-pub ahead of print date: 8 April 2020
Keywords: Aeroacoustics, Cavity flow, FW-H, High-speed train, IDDES, Pantograph, Pantograph recess

Identifiers

Local EPrints ID: 438984
URI: http://eprints.soton.ac.uk/id/eprint/438984
ISSN: 0167-6105
PURE UUID: 5fb500de-ef3d-4f91-a13d-803760f4a427
ORCID for Hogun Kim: ORCID iD orcid.org/0000-0001-6887-8483
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906

Catalogue record

Date deposited: 31 Mar 2020 16:30
Last modified: 28 Apr 2022 05:31

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Contributors

Author: Hogun Kim ORCID iD
Author: Zhiwei Hu
Author: David Thompson ORCID iD

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