Aerodynamic Performance of Leeward Side One During Trains Meeting on High-Speed Railway Bridges in Crosswinds

Abstract

When high-speed trains (HSTs) meet on a bridge in a crosswind environment, the train on the windward side (TWS) will produce a wind-shielding effect similar to a windbreak. This effect, coupled with the instantaneous pressure wave generated at the time of the meeting, will cause an abrupt variation in the aerodynamic load of the train on the leeward side (TLS) during the meeting process, thereby affecting the safe and stable operation of the train. This study analyzed the factors affecting the degree of the abrupt variation in the aerodynamic load of the TLS during the meeting, and studied the change rule of the safety index of the TLS under different wind speeds. In addition, we also explored the impact of three types of ventilation rate curved wind barriers on the abrupt variation in the aerodynamic load of the TLS during the meeting. The research results show that the increase in crosswind speed will increase the degree of the abrupt variation in the aerodynamic load of the TLS, further exacerbating the impact on the safe and stable operation of the TLS. Although the increase in train speed will reduce the magnitude of the abrupt variation in the aerodynamic load of the TLS during the meeting, it will increase the rate of abrupt variation. However, a curved wind barrier with a ventilation rate of 30% can effectively alleviate the abrupt variation in the aerodynamic load of the TLS during the meeting. These research results have important reference value for improving the driving safety of HSTs in crosswind environments.