Wind tunnel tests on train scale models to investigate the effect of infrastructure scenario

Cheli, Federico; Corradi, Roberto; Rocchi, Daniele; Tomasini, Gisella Marita; Maestrini, E.

doi:10.1016/j.jweia.2010.01.001

Cited by 133 publications

(72 citation statements)

References 5 publications

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“…The crosswind stability against overturning is a major design criterion for high speed railway vehicles and has been an experimental and/or numerical research topic for a number of scholars [15][16][17][18][19][20][21][22]. The experimental study allows to have a higher confidence in the absolute values of the measured aerodynamic forces where the numerical calculations allow to obtain a more detailed information of the flow field around the vehicle.…”

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Numerical investigation on the aerodynamic characteristics of high-speed train under turbulent crosswind

Asress

Svorcan

2014

J. Mod. Transport.

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Increasing velocity combined with decreasing mass of modern high-speed trains poses a question about the influence of strong crosswinds on its aerodynamics. Strong crosswinds may affect the running stability of highspeed trains via the amplified aerodynamic forces and moments. In this study, a simulation of turbulent crosswind flows over the leading and end cars of ICE-2 high-speed train was performed at different yaw angles in static and moving ground case scenarios. Since the train aerodynamic problems are closely associated with the flows occurring around train, the flow around the train was considered as incompressible and was obtained by solving the incompressible form of the unsteady Reynolds-averaged NavierStokes (RANS) equations combined with the realizable k-epsilon turbulence model. Important aerodynamic coefficients such as the side force and rolling moment coefficients were calculated for yaw angles ranging from -30°to 60°and compared with the results obtained from wind tunnel test. The dependence of the flow structure on yaw angle was also presented. The nature of the flow field and its structure depicted by contours of velocity magnitude and streamline patterns along the train's cross-section were presented for different yaw angles. In addition, the pressure coefficient around the circumference of the train at different locations along its length was computed for yaw angles of 30°and 60°. The computed aerodynamic coefficient outcomes using the realizable k-epsilon turbulence model were in good agreement with the wind tunnel data. Both the side force coefficient and rolling moment coefficients increase steadily with yaw angle till about 50°before starting to exhibit an asymptotic behavior. Contours of velocity magnitude were also computed at different crosssections of the train along its length for different yaw angles. The result showed that magnitude of rotating vortex in the lee ward side increased with increasing yaw angle, which leads to the creation of a low-pressure region in the lee ward side of the train causing high side force and roll moment. Generally, this study shows that unsteady CFD-RANS methods combined with an appropriate turbulence model can present an important means of assessing the crucial aerodynamic forces and moments of a high-speed train under strong crosswind conditions.

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Numerical investigation on the aerodynamic characteristics of high-speed train under turbulent crosswind

Asress

Svorcan

2014

J. Mod. Transport.

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“…Therefore, it is important to study the effects of different road conditions on the aerodynamic performance of the train to determine the aerodynamic performance and safety of the vehicle [8] . Trains are affected by aerodynamic loads when traveling on viaducts, embankments, and other infrastructure structures (Cheli et al 2010a) [9] . The aerodynamic forces of trains running on typical structures such as embankments and viaducts are investigated by wind tunnel tests (Suzuki et al, 2003;Bocciolone et al, 2008) [10][11] .…”

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confidence: 99%

Research on the Influence of Strong Crosswind on Aerodynamic Characteristics and Operation Safety of EMUs

Li¹,

Xiong²

2017

dtetr

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In this paper, the fluid calculation software CFD and the dynamic model software SIMPACK are used to study the influence of strong crosswind on the aerodynamic pressure, aerodynamic load and operation safety of EMUs on different road conditions. The influence rule of strong crosswind on the aerodynamic pressure and aerodynamic load of the train under different road conditions was obtained. Then the relationship between aerodynamic load and yaw angle and the critical wind speed curve of EMUs under different running conditions were obtained.

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“…In the literature of specialty [8], [9], [10], [11], [12], [13], [14], [15], the explanation of the "c", parameter corresponding to the determination of the drag, given by the aerodynamic phenomena, from Davis' equation for rail vehicles moving at speeds up to 250 km / h, in the longitudinal direction is expressed in the form given by relation (2): In the article "Aerodynamics of high-speed railway train" [16] the authors state that in a series of tests made in a "test tunnel" on TGV trains at a speed of 260 km/h they found that "Of the total aerodynamic drag, about 80% is given only by the body train aerodynamics, 17% of aerodynamics is due to the pantograph system and other devices on the train and the remaining 3% is caused by the braking mechanisms, etc. "…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis for aerodynamic drag of the electric locomotives

Sebeşan¹,

Arsene²,

Stoica³

et al. 2013

INCAS BULLETIN

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Wind tunnel tests on train scale models to investigate the effect of infrastructure scenario

Cited by 133 publications

References 5 publications

Numerical investigation on the aerodynamic characteristics of high-speed train under turbulent crosswind

Numerical investigation on the aerodynamic characteristics of high-speed train under turbulent crosswind

Research on the Influence of Strong Crosswind on Aerodynamic Characteristics and Operation Safety of EMUs

Experimental analysis for aerodynamic drag of the electric locomotives

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