Abstract
Wind barriers can effectively reduce the risk of overturning and derailment of high-speed trains running on a bridge under crosswind. However, it can adversely affect the wind resistance of the bridge. There are few studies on the aerodynamic performance of curved wind barriers. In this paper, the effects of curved wind barriers with four curvatures (0, 0.2, 0.35, and 0.50) and different train-bridge combinations on the crosswind aerodynamic characteristics of a train-bridge system are investigated. The results show that the curved wind barrier can significantly reduce the wind speed below a certain height on the bridge deck. The curved wind barrier with small curvature can better reduce the aerodynamic force of the train; however, it greatly increases the aerodynamic force of the bridge. A wind barrier with a curvature of 0.35 is recommended because it takes into account the aerodynamic characteristics of the train and bridge at the same time. The porosity of a wind barrier greatly influences the aerodynamic performance of the train on the track of the windward side of the bridge, while the wind barrier has little effects on the train on the track of the leeward side of the bridge. The aerodynamic performance of the train on the track of the windward side of the bridge is less affected by whether or not a train on the track of the leeward side of the bridge is present.
Highlights
As there has been a rapid development in high-speed railway systems in recent decades, the crosswind stability of trains has become a main concern [1,2,3,4]
The trains run on bridges that are far above the ground, which brings about a more complex wind environment and they are more affected by crosswind
The aerodynamic mechanism of curved wind barrier is revealed through analyzing the velocity streamline diagrams, wind profiles, pressure cloud diagrams, aerodynamic coefficients and the wind pressure distributions of a train that are obtained by numerical simula3tioofn2s0
Summary
As there has been a rapid development in high-speed railway systems in recent decades, the crosswind stability of trains has become a main concern [1,2,3,4]. Kozmar et al [10,11] used particle image velocimetry (PIV) to explore the shielding effect of the wind barrier and its influence on the flow field structure of the bridge, and optimized the height and porosity of the wind barrier. Deng et al [14] investigated the influence of the wind barrier on aerodynamic coefficients, flow field structure, and running safety of the high-speed train in the bridge-tunnel section by using numerical simulation. Ogueta-Gutiérrez et al [19] concluded that the curved barrier with solid screen can significantly reduce static loads of the train, but will increase bridge static loads, while adversely affecting the catenary above the railway line through a systematic experimental study Compared with parameters such as porosity and height, curvature is an important factor affecting the aerodynamic characteristics of curved wind barriers. The aerodynamic mechanism of curved wind barrier is revealed through analyzing the velocity streamline diagrams, wind profiles, pressure cloud diagrams, aerodynamic coefficients and the wind pressure distributions of a train that are obtained by numerical simula3tioofn2s0
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