Analysis of high-speed train flow structures under crosswind

Terence Avadiar; James Bell; David Burton; Heman Cormaty; Chao Li

doi:10.1007/s12206-016-0810-5

Analysis of high-speed train flow structures under crosswind

Terence Avadiar, James Bell, David Burton, Heman Cormaty, Chao Li

Mechanical & Aerospace Engineering

Research output: Contribution to journal › Article › Research › peer-review

7 Citations (Scopus)

Abstract

The flow structures along the length of a High-Speed Train (HST) are experimentally investigated under simulated crosswind conditions. The experiment uses flow visualizations and velocity measurements in a wind tunnel on a HST model at various angles of yaw. Surface visualizations shows the development of a longitudinal vortex, originating at the nose which travels along the leeward side of the train. A hypothesis is presented and tested proposing flow structures may repeat when the Boundary layer (BL) on the roof of the HST reaches maximum development or is “pushed off”. A key motivation is to evaluate the validity of using shortened HST models in a wind tunnel to correctly represent full-length trains. Using this theory, a shortened train model appears unable to completely model full-scale HSTs at realistic yaw angles.

Original language	English
Pages (from-to)	3985-3991
Number of pages	7
Journal	Journal of Mechanical Science and Technology
Volume	30
Issue number	9
DOIs	https://doi.org/10.1007/s12206-016-0810-5
Publication status	Published - 1 Sep 2016

Keywords

Aerodynamics
Boundary layer
Crosswind
Flow structures
Flow visualization
High-speed train
Wind tunnel

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10.1007/s12206-016-0810-5

Cite this

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AU - Bell, James

AU - Burton, David

AU - Cormaty, Heman

AU - Li, Chao

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AB - The flow structures along the length of a High-Speed Train (HST) are experimentally investigated under simulated crosswind conditions. The experiment uses flow visualizations and velocity measurements in a wind tunnel on a HST model at various angles of yaw. Surface visualizations shows the development of a longitudinal vortex, originating at the nose which travels along the leeward side of the train. A hypothesis is presented and tested proposing flow structures may repeat when the Boundary layer (BL) on the roof of the HST reaches maximum development or is “pushed off”. A key motivation is to evaluate the validity of using shortened HST models in a wind tunnel to correctly represent full-length trains. Using this theory, a shortened train model appears unable to completely model full-scale HSTs at realistic yaw angles.

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KW - Boundary layer

KW - Crosswind

KW - Flow structures

KW - Flow visualization

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KW - Wind tunnel

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Analysis of high-speed train flow structures under crosswind

Abstract

Keywords

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Analysis of high speed train flow structures under crosswind

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