Transient Aerodynamic Characteristics of Train Exiting from Bridge Tunnel Area Under Cross Wind

doi:10.12141/j.issn.1000-565X.220198

Abstract

Abstract:

In this paper, a cross-wind-train-bridge-tunnel model was established to conduct simulation calculation based on the unsteady characteristics of flow field under cross-wind action of high-speed trains. The accuracy of the numerical method was verified by 1∶8 dynamic model test. Then, the transient aerodynamic pressure, aerodynamic load changes and flow field characteristics inside and outside the tunnel were studied when the train broke out of the tunnel under cross-wind conditions, so as to reveal the interaction mechanism between cross-wind, train, bridge and tunnel. The results show that the pressure decreases gradually with the increase of cross wind speed, and the change law of pressure with time is similar. The cross wind has an obvious effect on the pressure gradient at the exit of the tunnel and outside the tunnel, but has almost no effect on the measuring point inside the tunnel. With the increase of cross wind speed, the peak value of the positive pressure on the leeward side outside the tunnel decreases slightly with the increase of wind speed, while the peak value of the positive pressure on the windward side basically remains unchanged. And the decrease rate of the peak value of the negative pressure on the leeward side is greater than that on the windward side. The cross wind has limited influence on the pressure fluctuation of train protruded tunnel. When the cross wind speed is 20 m/s, the scope of influence of the external flow field on the pneumatic pressure in the tunnel is less than 20 m. Under the same cross-wind condition, the pressure time-history variation rules at the measuring points on the windward side and the leeward side are different, and the position of the peak value of the pressure gradient is also different. The closer the measuring points on the same side of the train are to the ground, the greater the peak value and the absolute value of the peak value of the pressure gradient are. Under cross wind, when the airflow passes through the vehicle-bridge system, obvious flow separation occurs at the bottom of the bridge, the top and bottom of the leeward side of the train, resulting in the pressure difference on both sides of the train outside the tunnel is greater than that on both sides of the train inside the tunnel.

Key words: cross wind, high speed train, bridge and tunnel zone, transient pressure, flow field

CLC Number:

MAO Jun, HAN Chenyu, CHEN Minggao . Transient Aerodynamic Characteristics of Train Exiting from Bridge Tunnel Area Under Cross Wind[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(2): 54-64.

Figures/Tables 17

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