Experimental study on aerodynamic characteristics of a high-speed train on viaducts in turbulent crosswinds
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Experimental study on aerodynamic characteristics of a high-speed train on viaducts in turbulent crosswinds HE Xu-hui(何旭辉)1, 2, 3, ZUO Tai-hui(左太辉)1, ZOU Yun-feng(邹云峰)1, 2, 3, YAN Lei(严磊)1, 2, 3, TANG Lin-bo(唐林波)1 1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. National Engineering Laboratory for High-speed Railway Construction, Changsha 410075, China; 3. Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Changsha 410075, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: In this study, experiments were carried out to investigate aerodynamic characteristics of a high-speed train on viaducts in turbulent crosswinds using a 1:25 scaled sectional model wind-tunnel testing. Pressure measurements of two typical sections, one train-head section and one train-body section, at the windward and leeward tracks were conducted under the smooth and turbulence flows with wind attack angles between −6° and 6°, and the corresponding aerodynamic force coefficients were also calculated using the integral method. The experimental results indicate that the track position affects the mean aerodynamic characteristics of the vehicle, especially for the train-body section. The fluctuating pressure coefficients at the leeward track are more significantly affected by the bridge interference compared to those at the windward track. The effect of turbulence on the train-head section is less than that on the train-body section. Additionally, the mean aerodynamic force coefficients are almost negatively correlated to wind attack angles, which is more prominent for vehicles at the leeward track. Moreover, the lateral force plays a critical role in determining the corresponding overturning moment, especially on the train-body section. Key words: high-speed train; viaducts; aerodynamic characteristics; turbulent crosswinds; wind attack angle; train section shape; track position; pressure measurement Cite this article as: HE Xu-hui, ZUO Tai-hui, ZOU Yun-feng, YAN Lei, TANG Lin-bo. Experimental study on aerodynamic characteristics of a high-speed train on viaducts in turbulent crosswinds [J]. Journal of Central South University, 2020, 27(8): 2465−2478. DOI: https://doi.org/10.1007/s11771-020-4462-3.
1 Introduction A high-speed railway offers a fast, robust travel option that enhances the movement of people and serves as the main artery of the national economy as well as the significant national infrastructure system [1]. The total track mileage of the high-speed railway in service is currently over Foundation
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35000 km in China. Around half of these track mileages are on bridges of different spans and types, in which the major part is comprised of standard simply-supported box girder bridges. Wind-induced accident for a high-speed train (HST) is not uncommon. Aerodynamic forces induced by crosswinds are important to the lateral equilibrium of the HST, in such a way that if the lateral wind speed becomes larger than
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