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

10 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 Sept 2016

Keywords

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

Access to Document

10.1007/s12206-016-0810-5

Cite this

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title = "Analysis of high-speed train flow structures under crosswind",

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.",

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AU - Avadiar, Terence

AU - Bell, James

AU - Burton, David

AU - Cormaty, Heman

AU - Li, Chao

PY - 2016/9/1

Y1 - 2016/9/1

N2 - 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.

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.

KW - Aerodynamics

KW - Boundary layer

KW - Crosswind

KW - Flow structures

KW - Flow visualization

KW - High-speed train

KW - Wind tunnel

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DO - 10.1007/s12206-016-0810-5

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SN - 1738-494X

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SP - 3985

EP - 3991

JO - Journal of Mechanical Science and Technology

JF - Journal of Mechanical Science and Technology

IS - 9

ER -

Analysis of high-speed train flow structures under crosswind

Abstract

Keywords

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Analysis of high speed train flow structures under crosswind

Cite this