Aerodynamic load features of windbreaks of high speed railway under coupled action of cross wind and high speed train wind

The sliding mesh method was used to simulate the process of high speed trains passing through a windbreak region under cross wind. The single layer type and chamber type porous and corrugated plate windbreaks were used. The characteristics of flow field around train and windbreaks, time domain characteristics of windbreaks' aerodynamic load and frequency domain characteristics of fluctuating pressure caused by coupling between cross wind and high speed train wind were analyzed. The results showed that when there is no cross-wind, the train head car's impacting action is stronger than that of the tripper car be; when there is a cross wind, the head car's aerodynamic impacting action offsets cross-wind to dissipate its energy, while the tripper car's aerodynamic impacting action is coupled with cross-wind to amplify cross wind's aerodynamic impacting action against windbreaks; the single layer windbreak weakens cross-wind's action through changing its direction, while the chamber windbreak produces a large number of small vortexes inside chamber and wake flow to dissipate cross-wind's energy and it obviously reduces aerodynamic load of a single windbreak plate. © 2018, Editorial Office of Journal of Vibration and Shock. All right reserved.